Swainson's Thrush

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Catharus ustulatus

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Swainson’s Thrush

8365

Species code: SWTH Band size: 1B Skull: 1 Nov (Small windows may remain indeꢁnitely) Pyle: p397 Sibley: p407

Formaꢀve
Deꢁniꢀve Basic

Moult

10 primaries (10^threduced) 9 secondaries 12 tail feathers

Juvenile plumage is disꢀncꢀve. Formaꢀve and basic plumages are very similar. The absence of moult limits is not easily discerned.

Ageing

Use moult limits to separate formaꢀve plumage from basic plumage. Tail shape may be reliable in some cases, but intermediates occur. P10 length may also be useful.

Formaꢀve

Juvenile/Formaꢀve

Formaꢀve

Basic

Moult limit

Juvenile feathers among the great-

er coverts typically have buﬀy ꢀps.

Spots are generally larger on the

innermost feathers. Spots become

more subtle and may disappear

when feathers are worn.

Basic

Tail Shape

The angle of the feather ꢀp diﬀers. Formaꢀve = 88° angle Basic = 109° angle

Worn feathers may be misleading.

Juvenile

Basic

Sexing

No known plumage methods. During the breeding season cloacal protuberance and brood patch are well developed.

References: Collier & Wallace 1989, MacGill Bird Observatory, Morris & Bradley 2000, Pyle 1997, Tabular Pyle 2007. Images: David Hodkinson.

Compiled by David Hodkinson, 12 December 2011; North American ediꢀon
General editor: David Hodkinson - [email protected]

8365

Similar species: Hermit Thrush, Grey-cheeked Thrush, Bicknell’s Thrush & Veery.

Idenꢀꢁcaꢀon

Hermit Thrush
Swainson’s Thrush

P6 emarginaꢀon

Swainson’s - No emarginaꢀon

Hermit - Emarginated

Grey-cheeked - Oﬅen emarginated Veery - Slight emarginaꢀon

P6
P6

Wing Formula

Hermit: P9 < P6, Swainson’s, Grey-cheeked & Veery: P9 > P6

Hermit Thrush
Swainson’s Thrush

Back vs Tail colour

Swainson’s - No contrast Hermit - Tail colour contrasts with back colour. Grey-cheeked - No contrast Veery - No contrast

Gray-cheeked

Hermit Thrush
Swainson’s Thrush

Eye ring

Swainson’s - Buﬀy

Hermit - White

Grey-cheeked - Indisꢀnct, white Veery - Indisꢀnct, greyish

a Bird in the Hand is a collaboraꢀve project to gather, share and develop knowledge of bird aging and sexing techniques.

For more informaꢀon please visit: www.abirdinthehand.org

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Hermit Thrush (<Em>Catharus Guttatus</Em>) and Veery (<Em>C

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Warren County State Listed Animal Species Common Name Scientific Name Group State Status Federal Status Upland Sandpiper Bartramia longicauda Bird Endangered Cattle Egret Bubulcus ibis Bird Endangered Lark Sparrow Chondestes grammacus Bird Endangered Loggerhead Shrike Lanius ludovicianus Bird Endangered Blue corporal Ladona deplanata Dragonfly Endangered Goldeye Hiodon alosoides Fish Endangered Bigeye Shiner Notropis boops Fish Endangered Northern Madtom Noturus stigmosus Fish Endangered Indiana Myotis Myotis sodalis Mammal Endangered Endangered Snuffbox Epioblasma triquetra Mollusk Endangered Endangered Washboard Megalonaias nervosa Mollusk Endangered Clubshell Pleurobema clava Mollusk Endangered Endangered Purple Lilliput Toxolasma lividus Mollusk Endangered Rayed Bean Villosa fabalis Mollusk Endangered Endangered Sandhill Crane Grus canadensis Bird Threatened Least Bittern Ixobrychus exilis Bird Threatened Barn Owl Tyto alba Bird Threatened Sloan's Crayfish Orconectes (Rhoadesius) sloanii Crayfish Threatened American Eel Anguilla rostrata Fish Threatened Mountain Madtom Noturus eleutherus Fish Threatened March, 2020 Page 1 of 4 Common Name Scientific Name Group State Status Federal Status Paddlefish Polyodon spathula Fish Threatened Northern Long-eared Bat Myotis septentrionalis Mammal Threatened Threatened Black Sandshell Ligumia recta Mollusk Threatened Threehorn Wartyback Obliquaria reflexa Mollusk Threatened Fawnsfoot Truncilla donaciformis Mollusk Threatened Spotted Turtle Clemmys guttata Reptile Threatened Kirtland's Snake Clonophis