Topic 33: Birds

Question 1

Birds

Answer 1

Unique group of archosaurs evolved from feathered theropods.

Question 2

Archaeopteryx

Answer 2

Oldest known bird w/ feathers and wings but retained teeth, bony tail, and wing claws.

Question 3

Theropod and Bird Similarities

Answer 3

Hollow, thin bones
Egg laying and brooding
Similar organs

Question 4

Shared Derived Traits

Answer 4

Keratin Feathers
Hollow, Thin Bones
Beaks w/o Teeth
Digestive System Adapted for Flights
Reduced Organ
Endothermy
Complex Circulatory/Respiratory System

Question 5

Digestive Systems

Answer 5

A crop: for temporary food storage
A gizzard: muscle part of stomach w/ grit that compensates for the absence of teeth.

Question 6

Endothermy

Answer 6

Warm-bloodness, regulate their body temp. independently.

Question 7

Where do they lay eggs?

Answer 7

Return to land to breed and lay.

Question 8

Flightlessness

Answer 8

Evolved independently

Question 9

Mate via…

Answer 9

Copulation with cloacas.

Question 10

Precocial Species

Answer 10

Chicks able to feed themselves

Question 11

Atrical Species

Answer 11

Chicks are helpless and featherless.