Describe the anterior of achaeopteryx?
Skull with teeth
Describe the skeletal structure of the first known bird?
Very few fused bones, bones weren't hollow
What bone structure did the first bird lack?
No enlarged breastbone
Where were feathers located on
Describe passeriformes vocal structure?
Well developed vocal organs
T/F Young passeriformes are independent.
False, they are dependent young
Describe feet of passeriformes?
What kind of feet do sparrows have?
T/F Partially oxy
When are crocodiles mainly active?
Where are alligators mainly found in?
Southern US and China
How many species of alligators are there?
Describe the biggest crocodile caught?
21 feet, 2000+ lbs, saltwater crocodile in the Philippines
What blood is pumped to flight muscles in birds?
Fully oxygenated blood
Describe the heartbeat of birds?
How do birds regulate their body temperature?
Birds regulate their body temperature via Endothermy through metabolism. This
T/F The most ancient birds are capable of flight.
What are the second most ancient birds today?
Ducks, geese, waterfowl are the second most ancient birds today.
What are the third most ancient birds today?
Woodpeckers, parrots, swifts, and owls
T/F Birds of flight have many fused bones for flexibility.
False, have many fused bones for rigidity in flight
What 2 bones are unique to birds?
Wishbone and keeled breastbone
Where are large flight muscles attached in birds?
Wishbone and keeled breastbo
T/F Birds are tetrapods.
What kind of beaks do ducks have?
What kind of beaks do finches have?
What kind of beaks do pelicans have?
What kind of beaks do eagles have?
What kind of feet do ostric
What are the most diverse of all terrestrial vertebrates?
Birds belong to what class?
What has allowed aves to be so successful?
Aves are the direct descendants of what?
What was unique about the archaeopteryx?
What kind of feet do eagles have?
What kind of feet do ducks have?
What kind of feet do ostriches have?
T/F Ducks are the most ancient birds today.
FALSE, they are the second most ancient birds today.
How does a bi
How are birds birthed?
Oviparous with amniotic eggs
What 2 features of reptiles do birds lack?
Teech and tail
T/F Birds lack tails.
False, they have vestigial tails
What are feathers?
Modified scales made of keratin
Where do feathers develop from?