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CHAPTER 27MAMMALS
Luis SierraSamantha NateraJaqueline RamosJessy PizarroNayeli Rojas
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What is a mammal?
Mammals are endodermic vertebrates withhair. Female mammals have specializedglands called mammary glands, from which
mammals get their name.
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What are the adaptations of
mammals?
Many mammalian adaptations are associatedwith maintaining body temperature.
Hair and body size affect heat loss.
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Mammals adapt according to their
life style either run, swim, or fly.
The basic structure of themammalian skeleton enables high-speed running.
Mammals have the largest and mostwell developed brains in the animalkingdom.
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Monotremes
Characteristics
Monotremes are mammals that reproduce bylaying eggs.
Monotremes retain some of the characteristicsof their reptinian ancestors, such as layingeggs.
Monotremes cannot control their bodytemperature, and usually have a lower bodytemperature.
Duck-billed
platypus
Echidna
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Marsupials
Marsuopials aremammals that givebirth to a small,
immature young thatfurther develop insidethe mothers external
pouch.
Most of the nearly250 species ofmarsupials live inAustralia or on nearby
islands.
Mostkangaroosareherbivores,
and theycan travelabout 8 m ahop.
Koalas livein theforests ofAustraliaand eat only
the leavesand shoots
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Placental mammals
95% of all mammals areplacental mammals.
They are a very dispersegroup that make theirhomes in water, on land,
and in the air. They have specialized
adaptations for movementand obtaining food that fitthat fit the environment inwhich they live such aswater, land, or air.
They are divides intogroups according totheir characteristics:
Rodents
Lagomorphs
Bats
Carnivores
Cetaceans
Sirenians
Insectivores Elephants
Primates
Other
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Mammalian behavior
Mammals exhibit many different kinds ofbehavior, such as finding food, playing,and using tools.
For example bats are night-time hunters
that use echolocations to find food andavoid objects in the dark. Whales anddolphins also locate their preys byecholocation.
Mammals also have the ability to usetools. Chimpanzees for example, strip theleaves off twigs, and insert them intotermite mounds. Then they pull out thetermite-covered sticks and eat the insects.
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Playing enables animals to learn skills used inhunting and fighting. Play may also helpmammals gain physical strength and endurance.
Dog, bears, elephants, wolves, gorillas,chimpanzees, lions, leopards, and dolphins areexamples of this behavior.
Many mammals play! :D
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THANK YOU!
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