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What evidence has been found in early mammals that indicates they were active at night?
large eye sockets
Why did early mammals flourish after the extiction of dinosaurs?
many new habitats were available to them
What are the major structures of the mammal heart?
right and left atriums, right and left ventricles, septum
What major group of modern mammals is oviparous and is only found in Australiand New Guinea?
What major group of mammals is viviparous with a short development period in the mother and an external pouch where the young develops to maturity?
What major group of mammals is viviparous with a long development period inside the mother; the young is nourished through the blood supply of the mother?
What are examples of placental mammals?
rats, horses, elephants, moles, bats, monkeys, rabbits, sheep, whales, manatees
What are the characteristics of mammals?
endothermy, hair, four-chambered heart, mammary glands, single lower jawbone, specialized teeth
What are the types of teeth found in mammals and what is the function of each?
incisors-cutting; canines-tearing; premolars-shearing,shred, and grinding; molars-grinding
What is the role of the gnawing mammals in the food chain?
primary consumers that convert plants to meat
Which groups of rodents has a second set of incisor teeth located behind the first set?
rabbits, pikas, hares
Give examples of animals that are considered true rodents because they don't have a second set of incisors.
rats and mice
What is a cloven-hoofed animal?
a deer, bison, elk, antelope which has a hoof that is divided into two parts (toes)
What is a ruminant?
mammals that have a series of four stomach compartments capable of digesting larg amounts of fiber
What is the process of locating objects by emitting sounds and interpreting the sound waves that are reflected back?
What animals are in the order Artiodactyla?
deer, elk, bison, moose, cattle, sheep, goats, pigs, camels
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