21. Birds

Question 1

What is the defining characteristic of birds? (Four points

Answer 1

Feathers!!
The are endothermic (warm blooded)
Four chambered heart
One way airflow system using air sacs

Question 2

What are the two reptilian characteristics that birds have?

Answer 2

Birds and reptiles both have scales and lay eggs

Question 3

What is the name of the organism that is transitional between birds and reptiles?

Answer 3

Archeoxplex!! Its a theropods

Question 4

What are the three characteristics that show that archaeopteryx is a transition?

Answer 4

Beaks with teeth
Forelimbs (birds) with claws (reptile)
Hind toe (bird)

Question 5

What are four functions of feathers?

Answer 5

Flight
Temperature regulation
Waterproofing
Social signals

Question 6

What do the pictorial muscles, supracorcoidea, coracoid do?

Answer 6

Pectorial: pulls wings down
Supracorcoidea: raises the wings
Coracoid bone: brace between shoulder and keel

Question 7

What are some adaptations in birds to facilitate flight?

Answer 7

The wing is an extended forelimb
Feathers are placed in strategic areas for balance
Propulsion