2About 4,000 different species. What is a mammal *About 4,000 different species. What is a mammal? What characteristics do mammals share?
3Characteristics of Mammals Endothermic vertebratesSkin covered with fur or hairMost mammals are born aliveAll mammals breathe with lungsEvery young mammal is fed with milk produced by organs in its mothers body
4Characteristics of Mammals Most mammals have teethTheir teeth are adapted to chew their food, breaking it into small pieces that make digestion easier.Most mammals have teeth with 4 different shapes
5Mammal teeth Teeth with 4 different shapes: Incisors –to bite off and cut foodCanines– pointed teeth that stab food and tear into itPre-molars & molars have broad, flat upper surfaces for grinding and shredding food
6The size, shape, and hardness of a mammal’s teeth reflect its diet Ex. carnivores have large and sharp caninesEx. herbivores have molars for grinding and mashing plants
8Lion teeth: large canines used to hold prey while they kill it
9Herbivore teeth: rely on pre-molars and molars for grinding and mashing
10*Mammals breathe using lungs Mammals breathe in and out using a large muscle called the diaphragmThe diaphragm is located at the bottom of the ribsRib muscles and the diaphragm work together to help a mammal breathe in and out
13Why do mammals have fur or hair to cover their skin? They are endotherms, so they need to keep their internal temperature steady!All mammals have fur or hair to help them keep their internal temperatures stableAnimals that live in cold regions will have more fur than animals from warmer temperatures
14What else helps mammals keep conditions stable? FAT!Mammals have a layer of fat beneath their skinLike fur and feathers, FAT is an insulator
15Differences in amount of fur/hair often depends on the climate in which an animal lives.
16Mammals have a variety of adaptations to allow them to move in more ways than members of any other group of vertebrates
17A mammal’s nervous system coordinates its movements. Receives information about the environmentBrains of mammals help them learn, remember, and behave in complex waysThe senses of mammals are highly developed and adapted for the ways a species lives
18Examples: Tarsiers have HUGE eyes to allow them to see in the dark
19Squirrels learn to use different methods to crack different kinds of nuts, depending on where the weak point in each kind of shell is located
20Bats use a keen sense of hearing to navigate in the dark and catch prey
21Dogs, cats, and bears use their strong sense of smell to catch their prey.
22Antelopes can smell approaching predators in time to flee.
23Seals can see under water in near darkness Seals can see under water in near darkness. Their long whiskers help them get food by detecting the movements of their prey.