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The site was identified as important in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):

Species	Current IUCN Red List Category	Season	Year(s)	Population estimate at site	IBA criteria met
Siberian Grouse Falcipennis falcipennis	NT	resident	1998	present	A3
Black-billed Capercaillie Tetrao urogalloides	LC	resident	1998	present	A3
Swan Goose Anser cygnoid	VU	breeding	1978-1981	40-150 breeding pairs	A1, A4i
Lesser White-fronted Goose Anser erythropus	VU	passage	1979	14 individuals	A1, A4i
Common Goldeneye Bucephala clangula	LC	breeding	2004	present	A3, A4i
Scaly-sided Merganser Mergus squamatus	EN	breeding	2004	present	A1, A3
Mandarin Duck Aix galericulata	LC	breeding	1998	present	A3
Common Pochard Aythya ferina	VU	unknown	2004	present	A4i
Baikal Teal Sibirionetta formosa	LC	breeding	2004	present	A1
Falcated Duck Mareca falcata	NT	breeding	1998	present	A3
Eurasian Wigeon Mareca penelope	LC	breeding	1998	present	A3
Hooded Crane Grus monacha	VU	breeding	1979-1980	1 breeding pairs	A1, A3
Schrenck's Bittern Ixobrychus eurhythmus	LC	breeding	2004	present	A3, A4i
Pintail Snipe Gallinago stenura	LC	breeding	1998	present	A3
Green Sandpiper Tringa ochropus	LC	breeding	1998	present	A3
Common Greenshank Tringa nebularia	LC	breeding	1998	present	A3
Eurasian Pygmy-owl Glaucidium passerinum	LC	resident	1998	present	A3
Great Grey Owl Strix nebulosa	LC	resident	1998	present	A3
Blakiston's Eagle-owl Bubo blakistoni	EN	resident	2004	present	A1, A3
Steller's Sea-eagle Haliaeetus pelagicus	VU	resident	1978-1989	7-8 breeding pairs	A1, A3
Ashy Minivet Pericrocotus divaricatus	LC	breeding	1998	present	A3
Siberian Jay Perisoreus infaustus	LC	resident	1998	present	A3
Lanceolated Warbler Locustella lanceolata	LC	breeding	1998	present	A3
Locustella fasciolata	NR	breeding	1998	present	A3
Radde's Warbler Phylloscopus schwarzi	LC	breeding	1998	present	A3
Pale-legged Leaf-warbler Phylloscopus tenellipes	LC	breeding	1998	present	A3
Phylloscopus borealis	NR	breeding	1998	present	A3
Chestnut-flanked White-eye Zosterops erythropleurus	LC	breeding	1998	present	A3
White-cheeked Starling Spodiopsar cineraceus	LC	breeding	1998	present	A3
Grey-backed Thrush Turdus hortulorum	LC	breeding	1998	present	A3
Siberian Blue Robin Larvivora cyane	LC	breeding	1998	present	A3
Rufous-tailed Robin Larvivora sibilans	LC	breeding	1998	present	A3
Yellow-rumped Flycatcher Ficedula zanthopygia	LC	breeding	1998	present	A3
Mugimaki Flycatcher Ficedula mugimaki	LC	breeding	1998	present	A3
White-throated Rock-thrush Monticola gularis	LC	breeding	1998	present	A3
Bohemian Waxwing Bombycilla garrulus	LC	breeding	1998	present	A3
Japanese Waxwing Bombycilla japonica	NT	breeding	1998	present	A3
Brambling Fringilla montifringilla	LC	breeding	1998	present	A3
Chinese Grosbeak Eophona migratoria	LC	breeding	1998	present	A3
Japanese Grosbeak Eophona personata	LC	breeding	1998	present	A3
Pallas's Rosefinch Carpodacus roseus	LC	breeding	1998	present	A3
Pine Grosbeak Pinicola enucleator	LC	breeding	1998	present	A3
Loxia leucoptera	NR	breeding	1998	present	A3
Pallas's Bunting Emberiza pallasi	LC	breeding	1998	present	A3
Yellow-breasted Bunting Emberiza aureola	CR	breeding	1998	present	A3
Rustic Bunting Emberiza rustica	VU	breeding	1998	present	A3
Chestnut Bunting Emberiza rutila	LC	breeding	1998	present	A3
Tristram's Bunting Emberiza tristrami	LC	breeding	1998	present	A3

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2004).

Protected area (PA)	PA designation	PA area (ha)	Relationship of PA with IBA	Overlap of PA with IBA (ha)
Udyl'	Zakaznik (Federal)	100,400	protected area contained by site	0
Ostrov Krachiy	Nature Monument	5	protected area overlaps with site	0
Lake Udyl & the mouths of the Bichi, Bitki & Pilda Rivers	Ramsar Site, Wetland of International Importance	57,600	protected area contained by site	0

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Wetlands (inland)	Freshwater lakes and pools, Riverine floodplains	-
Forest	Coniferous forest (temperate/boreal)	-
Shrubland		-

For more information about the IUCN Habitat classification, please click here.

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Udyl' lake. Downloaded from http://datazone.birdlife.org/site/factsheet/udyl-lake-iba-russia-(asian) on 03/10/2023.