Can birds move their upper or lower mandible?
Upper
Identify this warbler:

Yellow Warbler
Identify this sparrow:

House Sparrow
Identify this bird:

Ruby-crowned Kinglet
What is a group of crows called?
Murder of crows
What feature allows bird's bones to still be strong even if they are hollow?
Crisscrossing struts or trusses
Identify this warbler:

Black-throated Green Warbler
Identify this sparrow:
Black-chinned Sparrow
Identify this bird:

Lapland Longspur
Where do Puffins nest?
Burrows/holes underground
What type of feet do ducks and geese have?
Palmate
Identify this warbler:

Magnolia Warbler
Identify this sparrow:

Lark Sparrow
Identify this bird:

Warbling vireo
What 3 birds on the bird list mimic other birds' calls?
Gray Catbird, Northern Mockingbird, Brown Thrasher
What are birds' "nostrils" called?
Nares
Identify this warbler:

Kentucky Warbler
Identify this sparrow:

Harris's Sparrow
Identify this bird:

House Finch
Name the type of feather:
Contour feather
What bird do these feet belong to?
Sora
Identify this warbler:

Yellow-rumped Warbler
Identify this sparrow:

White-crowned Sparrow
Identify this bird:

What is a group of Cliff Swallows called?
Creches