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Science: O&D Test 7

Across
What structure on a bird's sternum provides an attachment for the flight muscles?
The yolk body is held in place by two dense, twisted cords
Some birds migrate by moving short distances up or down a mountain
What special section of a bird's stomach grinds food
A bird 'bathing' himself in dirt
What organ produces oil that birds spread over their feathers
The smallest of all birds
These bills are for retrieving crustaceans burrowed in the sand
Birds have a ? chambered heart
Most birds are able to detect danger from all sides because they are designed with ? vision
A bird's most important flight muscles
Down
A flock of smaller birds is harassing a larger bird, what is this behavior
Of what substances are the shell membranes of a bird egg made of
Food-storage sac in a bird's esophagus
Largest flying bird
The soft, fluffy feathers found nearest a bird's body are ? feathers
What retactable group of feathers is supported by a bird's 'thumb' bone
The strong feathers found on a bird's body, wings, and tail
How many shell membranes does a bird egg have
The organ that allows birds to produce sound without vocal cords
When a bird loses it's old feathers
What are migration routes that birds follow year after year
A bird that is born with down feathers and is able to run shortly after birth
Plumage