Birds

Feathers help birds fly, stay dry and warm and __________________.

• Preen

• Hatch eggs

• Attract a mate

• Eat

Birds bones are _____________________.

• Solid

• Made of sandstone

• Hollow

• Heavy

Birds preen by spreading ______________ on their feathers, which makes them waterproof.

• Water

• Sand

• Vasoline

• Oil

Down feathers are _____________

• Thick and heavy

• Light and fluffy

• Cold and rough

• Jagged

Birds eat a lot because they need ________________ to fly and move.

• Energy

• Protein

• Solid bones

• Fish

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Modern birds don't have ________________.

• Legs

• Ears

• Teeth

• Claws

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Eagles can see ____________ times better than humans.

• 2

• 4

• 6

• 8

The powerful muscle that is attached to the large breastbone of flying birds is called a ________________.

• Bicep

• Precocial

• Keel

• Wingspan

Air moving around a bird's wing changes in speed and direction, creating a/an

_________________ force that keeps the bird in the air.

• Upward

• Downward

• Sideways

• Backward

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Most birds build nests out of_____________________.

• Twigs

• Dirt

• Leaves

• All of the above