Lecture 34: Aves and Mammals

Question 1

Shared common ancestor with birds?

Answer 1

Archaeopteryx

Question 2

Class Aves?

Answer 2

Birds and crocs are extant group of archosaurs

Question 3

Modern bird characteristics?

Answer 3

Amniotic egg
Scales on legs
Endothermic

Question 4

Adaptations for flight

Answer 4

Hollow bones
feathers
reduced digits
Horny beaks
Gizzard

Question 5

Precocial

Answer 5

Young feed themselves

Question 6

Altricial

Answer 6

Born helpless and featherless

Question 7

Bird ecology?

Answer 7

Terrestrial, freshwater, marine

preds, herb, scav, and omni

Question 8

Amniote Phylogeny?

Answer 8

Reptilia (birds) and Synapsida (mammals)

Question 9

Synapsids?

Answer 9

Hole in skull

non mammals extinct

Question 10

Therapsids?

Answer 10

Enlargment of dentary bone on jaw

Bony secondary palate

Question 11

Class mamalia characteristic?

Answer 11

movement of leftover jaw bone to middle ear
Mammary glands
Endothermic
Dentition different from reptiles

Question 12

Monotreme clade?

Answer 12

platypus and echidnas
Oviparous (lay eggs)
Cloaca
Lack teeth
Feed on invertebrates

Question 13

Mammals with placenta

Answer 13

Marsupials and eutherians

Question 14

Marsupials?

Answer 14

Born as partially developed embryo

Crawl to mother’s pouch

Question 15

Eutherians?

Answer 15

nourish young via placenta till well developed
then milk
no cloeca