Biology
Intro. to Birds
Work Sheet Total _____/
Name
Date
Period
1. Birds belong to the class _______________________.
2. Birds lack __________ in their beaks.
3. Birds have _____________________ eggs, upper bodies covered with __________,
and legs covered with ______________
4. Bird forelimbs are modified into ________________.
5. Feathers come from _____________, the reptile body covering.
6. The two main functions of feathers are to give lift for _______________, and for
conservation of body ___________.
7. __________________ feathers cover their body and give birds their shape.
8. ______________ feathers are specialized contour feathers on the wings and tail.
9. ______________ feathers are for insulation (conserving body heat.)
10. Feathers are made of _____________ and ______________ (little hooks that hold
barbs together).
11. Feathers are also used in a protective way as _____________, and to attract a
_____________.
12. The functions of _________ are to: re-link barbs together, and to clean and ________
The feathers with oil from the preen gland.
13. Birds have a light-weight ____________ with thin, ___________ bones.
14. The power for flight comes from large _____________ muscles, attached from the
wings to the breastbone or ________________.
15. The collar bones of birds are _____________ into a wish bone.
16. Birds can maintain their own body temperatures, which means they are
__________________.
17. Bird body temperature is fairly high in comparison to humans, permitting a high rate of
______________.
18. In order to fly for a long time, birds must satisfy a very high cellular demand for
_______________.
19. Bird lungs have ______________ that serve as holding tanks for air. No gas exchange
occurs here.