Rise of the Birds

Question 1

What 4 hypothesis for rise of Birds within Theocodonts?

hint ThatsCaMD T,CMD

Answer 1

1. Thecodonts
2. Crocodilian
3. Mammal
4. Dinosaur

Question 2

thecodont

Answer 2

ancestor of dinosaurs stood on 2 legs teeth (like word ortho-dont-ist in sockets

Question 3

What are 3 types of feathers?

hint think of alphabet a,B,C,D

Answer 3

1. contour
2. Down
3. bristle

Question 4

What are bristles?

Answer 4

short stiff feather

Question 5

what are bristles used for ?

Answer 5

screen (protect) from foreign objects

Question 6

What are contour feathers?

Answer 6

make airfoil (wing) and give external (outside body) form (shape) that is aerodynamic

Question 7

What is advantage of down (feathers)

Answer 7

insulation

Question 8

What are 2 possiible origins of Feathers?

Answer 8

1.reptile scales 2. Hair

Question 9

what is a homologous structure?

Answer 9

a body part that can be traced to a common ancestor

Question 10

which is homologous with feathers? reptile scales or hair

Answer 10

reptile scales

Question 11

what 2 things originate from epidermal and mesodermal tissue? ( feather, reptile scales or hair)

Answer 11

reptile scales and feathers

Question 12

Which one only originates from epidermal tissue? reptile scales , feathers or hair

Answer 12

hair

Question 13

What benefit most likely reason for initial development of feathers?

Answer 13

insulation

Question 14

What less likely first reason feathers happened?

Answer 14

flight (seems unlikely more likely evolved over time to fly but started as insulation

Question 15

What kind of impressions do some fossil dinosaurs have?

Answer 15

feathers

Question 16

were the early dinosaurs with fossils that had feathers used for flying?

Answer 16

no the early feathers were too short and not used for flying

Question 17

What is the only reason archeopteryx not considered a reptile?

Answer 17

the prescence of feathers

Question 18

What are the names of the 2 hypothesis for the origin of flight?

Answer 18

1. Arboreal (tree)

2. cursorial (cursory means learned as you go along)

Question 19

Which theory says flight learned from jumping gliding branch to branch in trees?

Answer 19

arboreal hypothesis

Question 20

what develops 2nd in arboreal (gliding hypothesis) of flight development?

Answer 20

flapping wings (evolved secondarily)

Question 21

Which theory says flying evolved from a behavior ,the anterior and ventral (back and forth) movement of forelimbs?

Answer 21

the cursorial hypothesis

Question 22

In the cursorial hypothesis of evolving flight what why were the forelimbs originally moving back and forth?
(anterior ventral movement)

Answer 22

to capture prey

Question 23

When did birds diversity into 2 major groups?

Answer 23

last part of Mesozoic (cretaceous period)

Question 24

What 2 bird groups split in cretaceous

Answer 24

primitive and modern birds

Question 25

what 3 letter word root do you look for that means Bird?

Answer 25

ORN like orn o thol ogist

Question 26

What body part did late cretaceous birds all have in common?

Answer 26

teeth

Question 27

What were the 3 late cretaceous genus of toothed birds?

Answer 27

1. hesper orn is
2. bapt orn is
3. ichythy orn is

Question 28

what does root of icthy mean ?

Answer 28

fish so think of seagull for this bird

Question 29

Only one of the late cretaceous birds could fly

which one . and what help rember?

Answer 29

ichythy orn is … because fish like seagulls hunt for fish and can fly