As the choice of species is a rather subjective matter, he's asking other birders to help him out by submitting their top 100 here.
What I find very interesting is Gunnar's intention of producing the book as a free e-book or to eventually use it to raise money for species in peril in cooperation with Birdlife International.
Sounds like it is not only a fun thing to do after all but something that might eventually make a difference.
Here is my top 100 list for those interested (no need to scroll down otherwise).
Frankly, choosing the top 100 from roughly 10,000 species was a bit hard since I sadly don't have field experiences with all the bird species in the world (working on it though). I also didn't have the time or literature to go through pictures of all the world's birds, so my choice is based on
a) what I have either seen already or at least know about from my travels or
b) on birds that are so prominent in one way or another that I have heard of them without specific search, sort of by simply being interested in birds, reading blogs, magazines, owning general birding books and other comparable coincidences.
Furthermore, I always tried to keep in mind the "see before you die" aspect, so I think the species must be very peculiar and unique. Therefore, I have not chosen a hummingbird, a trogon, a kiwi, a sunbird or any member of other flashy and colourful bird groups from the tropics (yes, I know the kiwis are neither colourful nor tropical, but it makes the sentence easier to read that way):
I think everyone ought to see at least one hummer and one species of kiwi before they leave for good, but which one they see seems less important from the perspective of mortality. So none of the species in the groups mentioned made the top 100, although each group as a whole surely would have achieved a very high ranking on my list.
Well, another little snag I hit:
I have two favourite birds, the Bearded Vulture as a firm and eternal No. 1 (yeah, pittas, even if I ever lay eyes on one of you ... not a chance, hear me, not - a - chance!) and the New Zealand Fantail a firm and eternal yet very close No. 2 (possibly along with other species of fantail if I ever get to see them).
For the rest of the top 100, the rating was done without giving it too much thought. A little thought was put in it, of course, or else the whole thing would be pointless. Still, any questions on why I rated species X three times higher than species Z is likely to remain unanswered if you expect more than a "just because" from me.
Anyway, that's the way the cooky crumbles and here's the list. Species in red are the ones I have already seen (adding that little showing-off element to the whole business of rating your top 100), species in black would be very nice lifers.
100 Bearded Vulture Gypaetus barbatus
99 New Zealand Fantail Rhipidura fuliginosa
98 Great Grey Owl Strix nebulosa
97 Wandering Albatross Diomedea exulans
96 Red-breasted Goose Branta ruficollis
95 Ivory Gull Pagophila eburnea
94 Spoon-billed Sandpiper Eurynorhynchus pygmeus
93 Northern Raven Corvus corax
92 Ross’s Gull Rhodostethia rosea
91 White-throated Sparrow Zonotrichia albicollis
90 Resplendent Quetzal Pharomachrus mocinno
89 Ostrich Struthio camelus
88 King Eider Somateria spectabilis
87 Andean Condor Vultur gryphus
86 Snowy Owl Bubo scandiacus
85 Philippine Eagle Pithecophaga jefferyi
84 Harpy Eagle Harpia harpyja
83 Ibisbill Ibidorhyncha struthersii
82 Dalmatian Pelican Pelecanus crispus
81 Spinifex Pigeon Geophaps plumifera
80 Gurney's Pitta Pitta gurneyi
79 Mandarin Duck Aix galericulata
78 Shoebill Balaeniceps rex
77 Ruff Philomachus pugnax
76 Scarlet Ibis Eudocimus ruber
75 Smew Mergellus albellus
74 Atlantic Puffin Fratercula arctica
73 Wallcreeper Tichodroma muraria
72 Harlequin Duck Histrionicus histrionicus
71 Kea Nestor notabilis
70 Blue Jay Cyanocitta cristata
69 Superb Fairywren Malurus cyaneus
68 Dupont's Lark Chersophilus duponti
67 Azure Tit Cyanistes cyanus
66 Firecrest Regulus ignicapilla
65 Eurasian Bullfinch Pyrrhula pyrrhula
64 Green Jay Cyanocorax yncas
63 Crimson-breasted Shrike Laniarius atrococcineus
62 Ocellated Turkey Meleagris ocellata
61 Yellowhammer Emberiza citrinella
60 Broad-tailed Paradise Whydah Vidua obtusa
59 Evening Grosbeak Coccothraustes vespertinus
58 Black Bee-eater Merops gularis
57 Blackburnian Warbler Dendroica fusca
56 Egyptian Plover Pluvianus aegyptius
55 Black Lark Melanocorypha yeltoniensis
54 Mute Swan Cygnus olor
53 Kagu Rhynochetos jubatus
52 Hoatzin Opisthocomus hoazin
51 Eurasian Hoopoe Upupa epops
50 Wrybill Anarhynchus frontalis
49 Northern Lapwing Vanellus vanellus
48 White Tern Gygis alba
47 Pin-tailed Sandgrouse Pterocles alchata
46 European Goldfinch Carduelis carduelis
45 Yellow-billed Loon Gavia adamsii
44 Mountain Bluebird Sialia currucoides
43 Greater Painted Snipe Rostratula benghalensis
42 Varied Thrush Ixoreus naevius
41 Gyrfalcon Falco rusticolus
40 Connecticut Warbler Oporornis agilis
39 Kentucky Warbler Oporornis formosus
38 African Skimmer Rynchops flavirostris
37 Steller's Sea Eagle Haliaeetus pelagicus
36 Lyre-tailed Nightjar Uropsalis lyra
35 Sunbittern Eurypyga helias
34 Marabou Stork Leptoptilos crumeniferus
33 Superb Lyrebird Menura novaehollandiae
32 Black Grouse Tetrao tetrix
31 Secretarybird Sagittarius serpentarius
30 Ovenbird Seiurus aurocapilla
29 Pied Thrush Zoothera wardii
28 Painted Bunting Passerina ciris
27 Blue Crane Athropoides paradiseus
26 Black Heron Egretta ardesiaca
25 Golden-winged Warbler Vermivora chrysoptera
24 Northern Parula Parula americana
23 Black-throated Blue Warbler Dendroica caerulescens
22 Black-and-white Warbler Mniotilta varia
21 African Finfoot Podica senegalensis
20 Flightless Cormorant Phalacrocorax harrisi
19 Violet-backed Starling Cinnyricinclus leucogaster
18 House Sparrow Passer domesticus
17 Locust Finch Paludipasser locustella
16 Scarlet Tanager Piranga olivacea
15 Bohemian Waxwing Bombycilla garrulus
14 Royal Spoonbill Platelea regia
13 Great Bustard Otis tarda
12 Pied Avocet Recurvirostra avosetta
11 Grey-necked Rockfowl Picathartes oreas
10 Bluethroat Luscinia svecica
9 Sage Grouse Centrocercus urophasianus
8 Beautiful Nuthatch Sitta formosa
7 Blue Swallow Hirundo atrocaerulea
6 Gray's Lark Ammomanopsis grayi
5 Olive-sided Flycatcher Contopus cooperi
4 Budgerigar Melopsittacus undulatus
3 White-winged Flufftail Sarothrura ayresi
2 Black Harrier Circus maurus
1 Christmas Frigatebird Fregata andrewsi

