Lesson 2 Animals With Backbones Animal Kingdom Lesson 2 Animals With Backbones

What are vertebrates? Animal with a backbone is called a vertebrate. The backbone is part of the endoskeleton. Holds up the body Allows big animals to move around.

7 Classes of vertebrates Jawless fish Cartilaginous fish Bony fish Amphibians Reptiles Birds Mammals

Warm-blooded or Cold-blooded A warm-blooded animal has a body temperature that stays the same. Warm-blooded uses energy from food to keep the same body temperature. A cold-blooded animal has a body temperature that changes. The temperature changes with it’s surroundings. They get heat from outside its body

Fish Fish are cold-blooded vertebrates. There are 3 classes of fish: jawless fish, cartilaginous fish, and bony fish. Jawless fish- have skeletons made of cartilage, mouths that act like suction cups, and they have no bones in their mouth. Example: lamprey

Fish continued Cartilaginous fish- also have a skeleton made of cartilage Example of a cartilaginous fish : shark Bony fish- largest class of vertebrates Have skeletons made of bones and they are covered in scales. Examples of bony fish: goldfish, bass, and tuna

Classes of Vertebrates Cold-blooded: cartilaginous fish, reptiles, jawless fish, amphibians, and bony fish Warm-blooded: birds and mammals

Quick Check Which type of vertebrate has a body temperature that stays the same? Which type of vertebrate has a body temperature that changes with its surroundings? Which classes of vertebrates are warm-blooded? Are most classes of vertebrates warm-blooded or cold-blooded?

What are some other vertebrate groups? Amphibians Reptiles Birds

Amphibians Cold-blooded Spend part of lives in water and part on land Skin needs to stay wet or if it dries out it will die Adults have lungs, but it can also breathe through its skin. Must live near the water

Reptiles Include snakes, turtles, and lizards Cold-blooded vertebrates Have dry skin that is covered with scales or plates They breathe with lungs and do NOT breathe through their skin Their eggs have a tough covering that protects them and keeps them from drying out.

Birds Warm-blooded vertebrates with feathers Feathers are light but keep them warm and dry. They have beaks and two legs with clawed feet. Not all birds fly Their bones are lightweight, hollow to help them fly. Have strong muscles and lungs They lay eggs with strong shells and most sit on their eggs to keep them warm until they hatch.

What are mammals? You are a mammal! Is a warm-blooded vertebrate with fur or hair. Can live in trees, water, and most other places on Earth! Give birth to live young, but some lay eggs. Mammals care for their young and females give milk to their young.

Groups of Mammals Mammals that lay eggs- only one is the duck-billed platypus and the spiny anteater Mammals with pouches- kangaroos, koalas, and opossums carry their young in pouches until the young are fully grown. Mammals that develop inside- sheep, bats, apes, and all other mammals develop inside the mother’s body.

Quick Check A mammal’s body temperature stays the same. It is ____________. Mammals have fur or _________. Mammals can live in trees, ________, or __________. Name an example of a mammal that has a pouch.