Thursday, 15 March 2007

Hunting for the Ivory-billed Woodowl

Before I start, a short comment on the weather here in South-East Michigan:
On Tuesday we had 63 degrees Fahrenheit (equivalent to almost 20 °C) and on Thursday morning there was fresh snow on the ground. Madness!


OK, what is this post all about? Dare to guess?

No, it is not a report of a newly described species of Owl in Africa, the Wood Owl there remains (systematically) alone (nicer picture here).
No, sorry, wrong again: it is also not a typo, I did mean Woodowl, indeed, and not 'pecker.

Yes, all right, I tell you:
You see, as a new arrival to North American birding, I am absolutely fascinated by the Ivory-billed Woodpecker story. Hey, to most of you, this is probably a debate that's been going on for the last ... well ... roughly 60 years, sometimes more intense (like now), sometimes more subdued. But to enter the show now and really dig into it with a still unspoilt sense of humour is just great.
Just the number of blogs and websites on the topic is quite something and with everyone waiting for the definite photo to be shot any day now (or never?), checking these web sites for news is more exciting than checking the latest opinion polls for Ohio or Florida during an election in the US.
Back to the title of my post:
What do all the blogs and web sites on the search for the Ivory-billed Woodpecker have in common?
Well, apart from a repetition of the words "intriguing", "interesting", "data" and "evidence", they are characterized by a conspicuous scarcity of recent Ivory-billed Woodpecker encounters and especially photos. But one species we often find mentioned or even depicted there is the amazing Barred Owl, e.g. here. This is not all too surprising as it is apparently relatively common in the south-eastern United States.
The Barred Owl also occurs, be it in a reduced density, in South-East Michigan and the local email forum was recently just buzzing with reports of up to two birds showing very well at Stony Creek Metropark north of Detroit. And you see, this is where another factor suddenly makes quite a massive appearance: It is an owl and as such an impossible, invisible and de facto non-existing creature (see here), it is nice and big and most important of all, I had never seen it before.
So when Laurent and I were discussing the options of half a day's birding last Tuesday, there was a certain tendency to go for the owl. But of course, it is a far drive and there had been a multitude of reports of White-winged Scoters around Washtenaw County, so we were indeed a bit reluctant on reaching a verdict on where to go. These pictures then probably triggered the final decision: we went for the Owl!

So there you have it, the title of my post:
We went "hunting" for an owl that lives in the woods, is somewhat connected to the Ivory-billed Woodpecker thereby profiting from the mystique surrounding it and if you look closely here, well, it even has an ivory-coloured bill!

And here's how it went:

Driving from Ann Arbor to Stony Creek Metropark is not all that easy or quick when you don't know how best to get there and the road we decided to take would surely have terrorized even a Congolese Bush Taxi driver but at least on the way there the birds were with us. Best of all was probably a Sandhill Crane standing on the ice of one of the smaller - still frozen - lakes wondering where on earth his swamp went. This link here depicts the scene rather nicely, and all I can contribute is a Sandhill Crane from Michigan's Upper Peninsular taken in May 2005, but a picture is better than not a picture.


Eventually we got to the park entrance with the car still in one piece and inquired at the main office if there was any news regarding the Owl. The only information we got however was that the staff there didn't really know anything about the owl apart from the fact that a lot of people had come up to them recently and asked, so we were grateful for the description of the site in the email Laurent had printed out before the trip.

So off we went into the park and on to the parking area described in the email. On the way there came the next nice species of the day (after the Sandhill Crane) in the shape of a bunch of Wild Turkeys. Well, there may be scarcer birds in North America but the Turkey will always be an impressive bird to watch, so we were already starting to feel quite well and pleased. The Turkeys finally left the lawn and disappeared into the undergrowth, so we continued on our quest for the Owl, parked the car and proceded into the wilds of Stoney Creek Metropark.
Allright, admittedly, venturing into the wilderness there was not quite the same challenge as, say, the Yukon because the Barred Owl had been found in a bunch of pines along a small forest track right next to the parking area, but we still made only slow progress along the path checking each and every pine tree along the way. No owl yet, but looking up, a sudden flash of pale white blinded our sight and we became aware that what had just flown over us and pushed our retinas to their limits was not a Red-tail, not a Coop, nope, it was a plain brilliant adult Northern Goshawk! What a day! My first ever encounter with the North American subspecies of Goshawk, a form I had been searching for around Ann Arbor (well, around the Arb, to be more down-to-earth) all winter long finally made an appearance! Great!

That sighting however meant that we had at once used up a whole lot of our daily portion of birder's luck and I feared we would later regret it...
We had finally covered the whole area as described for the owl in the emails without success and I had a sudden rush of comprehension: it was indeed an OWL we were looking for and that Snowy Owl was indeed the exception to the rule and I was just a very naive fool to have thought times had changes. We had run out of pines and there was no owl in sight. Oh dear.
Beyond the trail was a small stand of around 30 or so dense and high spruce trees and I heard a single Black-capped Chickadee warning angrily. Oh, I know what you think now "that's the owl, that's the owl", but those chickadees have darn far-reaching warning sensors and I have chased a few of those angry bundles of feathers through the Arb to later find that - even though I had been probably 50 metres away at first - I myself was the likely source of disturbance that had caused the calls.
So I remained calm, but Laurent and I followed a foot path (seen on the picture below) into the spruce stand towards the chickadee (which by then had come to us and continued its scolding, proving me right in my less than optimistic approach towards owling by following angry chickadees).

Somewhere out there might be an Owl

We eventually split to check out each single tree from different directions for better coverage and what can you say, I needn't have worried all day with Laurent "Owl Scout" by my side. It was probably less than two minutes and he quietly called me over to look at ...

Can you see it ??
Y E S !!

The Barred Owl.
Yes, the Barred Owl, and a beauty. I know I shouldn't be saying this without a firm background of Barred-Owl-Experience but I am sure it was the most amazing of all the Barred Owls in the world, and I knew that by intuition even without having seen them all!
Below is a photo Laurent took of our owl in case you haven't found it on my picture above.
Here's our bird!!


Needless to say, the looks through the scope were just ... yeah, as I said: needless to say, you get the picture.

THANKS TO THE FINDER FOR POSTING ITS WHEREABOUTS

After around half an hour with our owl (of course it was "ours" by then), we continued our birding day down on Belle Isle. There had been posts about Scoters around the island so we were curious to go and look for them and Belle Isle is often a good spot in general. Well, it is unfortunately also a good spot for anyone in Detroit to enjoy a bit of outdoors recreation on a sunny day and we weren't what one would describe as alone on the island. So of course, with people everywhere the birds were not - everywhere that is.
First stop was at one of the duck feeding sites which hardly ever produce extraordinary species but the feeding frenzy is nice to watch and you get close-up views of a few species which are always appreciated, and a Black Duck amongst the Mallards and Canada Geese was a nice surprise.

Using binoculars here (above) means you are really getting down
to the details, the fine tuning of bird identification

Nice drake Black Duck - I had never seen that species so close before

Here too, like everywhere else in the world apparently, the ducks had a very hard time defending their own against the mobbing gang of the much more agile gulls.


Ever read "The Lost World", with the deciding battle between the humans and the ape-men?
Challengers words after the battle that left the ape-men mostly dead: "We have been privileged to be present at one of the typical decisive battles in history - the battles which have determined the fate of the world. What, my friends, is the conquest of one nation by another? It is meaningless. Each produces the same result. But those fierce fights, when in the dawn of the ages the cave-dwellers held their own against the tiger-folk, or the elephants first found they had a master, those were the real conquests - the victories that count."

One of these days, I predict, the ducks will rise against the oppression of the gulls at the feeding sites and finish them off once and for all in a decisive battle that will determin the fate of the world - if you're a Guller. So enjoy this image of a Ring-billed Gull in flight, it might soon be a rare sight and replaced by a hovering Mallard.


In the North of Belle Isle is a small lagoon which is a safe haven for birds unless frozen, which it mostly was when we got there. A small area of open water however had remained and we were pleased to watch a small flock of Canvasbacks trying to get some rest while a few Bufflehead were giving them a hard time doing so because of their energetic courtship / competition behaviour, chasing each other around like little puppies on the lawn. Oh yeah, there were also Canada Geese. One somehow tends to neglect the mentioning of them. Maybe it is because they are everywhere? Well, possibly.


The open river to the north of the Island was a maze of open water in between numerous small sheets of ice floating down. I suspect the quick movement of the ice made it a place too annoying for most ducks to stay at because there were none around. Not even a single Scoter we had counted on ... unreliable little rascals.


We finally had to leave Belle Isle to avoid the rush hour in Detroit and on our way out saw that quite a few ducks were stationed along the last bit of coast we had not checked, so we had missed the main attraction of Belle Isle that day by an unlucky accumulation of bad luck, but at least we made it through Detroit quite allright and in time to pay Ford Lake a short visit. There, we found (or rather re-found as it had been reported as being reliable at the site) a nice Horned / Slavonian Grebe and a mixed flock of Aythyas, mostly of Lesser Scaup, Ring-necked Ducks, Redheads and a few Canvasbacks as well as a Ruddy Duck but honestly, after Goshawk and Barred Owl that was all just the nice decoration, like the fruit and paper umbrella on your cocktail that you appreciate but that was not the main reason for really having enjoyed your drink.

So, what's next?
That's a question easily answered: Eastern Screech Owl and Great Horned Owl.
Laurent mentioned how much he'd enjoy seeing a Burrowing Owl. We are a bit far here in Michigan from its regular haunts, but who knows: up to now, owling's been easy enough to regain some optimism.

Finally, here is a link you've probably all seen before, but it is just too good to not include in this post. Nature does have a sense of humour!

Monday, 12 March 2007

Spring, Spirng, Spring, 3 days of Spring!

Yes, I actually managed to get some real first-hand out-in-the-field away-from-the-laptop birding done.
Who'd have guessed it?
Well, me.
Because: the last few days were marvellous and we finally are enjoying a taste of spring. Since last Friday, the skies have been blue (cloudy today again), the sun's been out and - gosh - I didn't even need to put on my extra warm underwear before leaving my apartment.
OK, here are the failures of this hopefully past winter birding:
- No Thayer's Gull
- No looking for Snowy Owl at Ann Arbor Airport
- No twitching of Harlequin Ducks
But that's all history now, and here and now are the promises of Spring !

Friday was the best in a series of three consecutive days at the Arb. Yes, three days!

It was the first warm day this year so at around 2 p.m. I decided to call it a work day and head off towards the Arb and Gallup Park to see what was floating on the Huron.
Walking past the Bell Tower I looked up and there was a Turkey Vulture circling over downtown Ann Arbor. Oh, I missed them so much, such a long time without watching TV! That was arrival No. 1!
The Arb was rather busy with Joggers - hmmmm, I had successfully managed to forget there were also non-birders using the Arb - but I nevertheless managed a very, very fine encounter with a Hermit Thrush. And as always, Catharus-thrushes proved to be the true friends of birders. Just by following it with my binoculars through the brushy forest floor, it lead me to 2 Northern Cardinals, a handful of Dark-eyed Juncos, one of which had a few white feathers around the eye, and a Carolina Wren. That was neat. I was surprised however that the woodpecker activity was very low with only a few calling Downy Woodpeckers.
Upon reaching the Huron, I walked along the bicycle trail downstream towards Gallup Park, soaking in the delight of watching Red-tailed Hawks, a Sharp-shinnedHawk and a Cooper's Hawk. Songbirds were also plenty along the river, more than at the Arb, and I quickly added another Carolina Wren, an Eastern Bluebird, a flock of American Robins, Cedar Waxwings, White-throated Sparrows, Tufted Titmouse, Black-capped Chickadee, lots and lots of Mourning Doves and White-breasted Nuthatches to my list.
Then came arrival No. 2 in the form of a singing Song Sparrow. Also very nice as I had hardly seen them before their departure last fall.
But the real star of the day, no matter how common, the real treat, the price beyond anything, the ultimate superlative was...

The Return of Red-winged "The Voice" Blackbird!

Seriously, NO bird has a song that's so much beyond cool, and I tell you: they are great to have around again.
OH, and a few bad ass Common Grackles were there as well.

The Huron was extremely productive regarding waterfowl and upon reaching Gallup Park, I had found Pied-billed Grebes, Mute and Trumpeter Swans, Canada Geese, Wood Ducks, Mallards, Gadwall, Canvasbacks, Redheads, Ring-necked Ducks, Goldeneyes, a single Lesser Scaup, Common and Hooded Mergansers and American Coot.
Very, very nice.

Returning home through the Arb, it got a bit late and I came across a very angry Hairy Woodpecker whose behaviour however afforded me a deep scientific insight into woodpecker anatomy:
It was apparently about to go to bed in one of the small tree cavities when I disturbed it and so it started its scolding peek, peek, peek. Of course I retreated somewhat and the woodpecker eventually approached and entered its tree cavity but even after it had submerged completely, I could still hear its warning call, somehow subdued by the tree trunk.
Now, you see, that is strange: if it is a warning call, the 'pecker obviously still regarded me as a danger to himself when it approached the cavity. So it shouldn't have entered in the first place with me still around. And even after it had entered it kept on calling, a really stupid use of a warning call because it would guide any potential predator to its hiding place.
So here's my new hypothesis on why so many woodpecker warning calls are this high, sharp staccato "peek, peek":
These calls are not warning calls after all. The woodpecker doesn't even utter them on purpose.
No, very likely, the special anatomical adaptations to hammering one's head against hard wood to make a living have rendered these woodpecker species prone to hick-ups.
So as soon as they get nervous, their hick-up kicks in and they can't stop for a long, long time, in this case even after a safe retreat into a tree cavity.

Well, am I glad I was trained as a scientist. The world would be so much less exciting without a good piece of science to finish one's birding day.

[Short comments on Saturday and Sunday to follow]

Thursday, 1 March 2007

Owling in the Rain

After the Snowy Owl incident I had decided to also show some good will and improve my relationship towards owls, trying to shift from non-existent to peaceful coexistence. More precisely, I came up with that idea, a little citizen science project:
I had planned to check (and count) as many of the conifers around Ann Arbor as possible and register all the owls I see, then use Google Earth to count all the conifers in Washtenaw County and calculate the total number of owls. Pretty smart, as you'll surely agree.
So while out hunting for groceries to the North of town today, I went to Deer Hill again, because that is a fabulous place for conifers and thus was bound to hold a fabulous amount of owls, especially with Long-eared Owls supposedly on the move.
I have - I must confess - encountered a slight problem with my little citizen science project: a total lack of owls. Well, on the one hand I don't mind having and easy go at doing the maths but then again, what good is using aerial photography to count all the conifers when there's no owls to include in the calculation?
So off I went to the bus and off I got at Deer Hill. Strangely, going to Deer Hill to look for owls sounded like such a good plan at the apartment, but now that I was outside, the part that made this plan look so good seemed to be missing. Maybe it had something to do with the sleet and icy rain that came down heavily, maybe with the fact that each time I looked up into a tree, the wind shook a gallon of icicles and water drops out of a branch and right into my face or maybe it was the fact that an owl's white-wash is so hard to spot in the snow, but I somehow had the impression I was in perfect harmony with the sky above in being not very bright standing out there in the rain and staring at empty trees.
OK, I have to back off a little here: I did find a Blue Jay and two squirrels and had two Mallards flying over and an American Crow nearby.
I eventually decided to forget about the owls and go for some groceries. They are much more dependable in their occurrence and easy to find as well, and their ecological attachment to heated malls was another advantage. I only wish Eastern Screech-Owls would feed on shredded cheddar.

Tuesday, 27 February 2007

Shocking News!

German researchers from the University of Karlsruhe have now proven what all of us knew by intuition:
The weekends receive more bad weather then the weekdays!

Seriously, here's the link (in German though)!

They analyzed the weather data from 12 German weather stations collected during the years 1991 to 1995, a total of 6.3 Million readings, which isn't bad statistically.

Their results:
The average amount of sunshine on Mondays exceeds the Saturday sunshine by 15 minutes. And the weekend cloud cover surpasses the cloud cover during the week by 10%. It also rains more during the weekend, with rain intensity increasing by 15 % during the course of the week.

This phenomenon was evident at all 12 weather stations and was independent from the location e.g. within cities or out in the countryside.

OK, the drawback is that they have only measured but not explained it. They suppose it has something to do with the dust particles produced by e.g. burning fossil energy which happens more during the week when everybody is working than on the weekends when everyone is at home.

Now, is this good news or bad news for us birders?

Hard to say, depends on how good we can manage to adjust to it:
Hawks which are dependant on thermals e.g. should be chased after during the week, but if you're hoping for a warbler "fall-out" at Point Pelee during this year's spring migration, better get there on a weekend!

Bare Part Colouration in Common Gulls

Well, I know my posts recently haven't been all too exciting but as a matter of fact I have been working. Not only for my employer, oh no, also a little bit here and there on a few more extensive identification posts for that wonderful Cooperation project with Charlie Moores. Good stuff hopefully and soon to come...
In the meantime, and with the weather being not so nice for birding anyway, I went through my archives in search of something meaningful to put on the blog. So in - sort of - preparation for the Gull article Charlie and I are working on, here are a few comments on the development of bare part colouration in the Common Gull, Larus canus. The term "Common Gull" here does only pertain to the Eurasian forms Larus canus canus and possibly L. c. heinei (or intermediate birds between the two) and does not include the North American Mew Gull!
And as always a word of warning: the quality of the images you're about to see is excessively brilliant, actually so much so that you may never again want to look at bird photographs or even re-visit this blog. If you proceed: you have been warned!

The general concept of bare part colouration in Common Gulls as seen on the German Baltic coast during winter is as follows:
1) During their first winter after fledging, both the bill and the legs are rather bright pink and the bill shows a black tip.
2) In late winter or spring the pink gradually changes into a greyish blue which is maintained throughout the second winter until the next spring.
3) With the moult towards an adult-like plumage, the bare parts change from pale grey-blue to a more or less bright yellow, the less bright birds show a greenish/grey tinge to the yellow.

Here are a few examples of first-winter birds, all taken at the Stralsund waterfront during January and February.

The next three images show birds with bright pink bare parts. This is common during early winter and those birds that maintain a large part of their juvenile / first winter plumage into spring also seem to maintain the pink bare parts.



On more advanced birds (with a cleaner white body and a largely grey mantle) or later in winter/early spring, the change in bare part colouration becomes apparent, mostly on the bill which changes to a cold blue-grey. The legs however often seem to remain pink for a longer period.


By March however most first-winter birds show more or less greyish bare parts and only a minority still shows pink prominently.


Second winter birds are also variable in their bare part colouration:
Most birds one encounters are showing the pale blue-grey that has been acquired during their late first-winter phase. In those birds all the wing coverts visible on the folded wing of perched birds are grey and adult-like.
This is demonstrated on the next few images.


Some second winter birds however show a brownish tinge to their wing coverts and a blackish base to the tertials and it is these birds that usually still show some pink on their bare parts, most obvious on their legs. This pink however is not as bright as on average first winter birds.


This little bugger never stopped preening while I watched it, so I never got a picture of it with its head out.

In their third winter, Common Gulls have reached adult plumage and show yellow legs and bills. The yellow tone varies however individually or geographically (the Eastern heinei supposedly showing brighter yellow) and ranges from pale grey-green-yellow to bright yellow.
This variation is demonstrated on the next few images:



OK, this is all well-known and nothing new. Additionally, the pictures were horrible, so where is the punchline of this post?

The punchline is a bird I saw on the Baltic Coast on March 13th, 2006!
It was easily aged as a second winter bird by the brownish primary coverts, the limited amount of white on the wing tip and the bare part colouration which was not yellow.
BUT even though it was clearly an "advanced" second winter bird with a mostly adult like plumage on the folded wings, it showed bright pink bare parts that would even be unusual in first winter birds this late into spring!
Here are the images:


Surprised?
Well, I sure was.

A Gull so fair and foul I've never seen:
Fair for being such a great surprise and an exciting bird to find.
Foul for demonstrating once more the unpredictability of gulls and the chaos connected to plumage and bare part development!

UPDATE
Today seems to be Gull day on the blogosphere!
Check out this, this, this and this!
And frankly, this is admittedly far more exciting than a pink-legged 2nd winter Common Gull...

Saturday, 24 February 2007

Hit the Trails

It's Saturday. Saturday is regarded as part of the weekend in most modern societies. Which is a good thing because it should mean a rest from the week's worries. Good idea, nice concept.

I am only mentioning this in case anyone out there hadn't noticed yet it was Saturday.
I haven't, really.

I am working.

Well, I should be working, to be honest, but sometimes it is hard to concentrate.
So I went on a little virtual trip and have discovered a nice online source for birders in North America, the "birding trails".

Exciting information about where to go and what to expect there, tons of birds I have never seen. Terrific, exactly what I need right now to make my day...

Oh, heck, I am being sarcastic, but these sites are really great and regarding my work assignments, it's about time that "the times they are a'changin", and I am sure there are brighter times ahead.
Here are a few of the many links for anyone who's stuck in front of their computer as well and also needs a Ptarmigan or Scrub Jay fix bad:

Colorado Birding Trail

Great Florida Birding Trail

Birding Trails of Louisiana

Montana Birding and Nature Trail

Nebraska Birding Trails

Oregon Birding Trails

Great Texas Wildlife Trails

Apparently there's no online Michigan Birding Trail yet (good thing, otherwise Florida, Texas and California would run out of active birders), but hey, we don't need this, we got the ABA guide to call our own!

Enjoy your online birding while you can, spring is near!

Friday, 23 February 2007