Classifying Animals Vertebrates Chap. 3, lesson 2, pages 51-65
Animals divided into 2 groups • Vertebrates • These are animals with backbones. • Over 50,000 species of vertebrates in world • Some examples are: • humans • hummingbirds • Blue whales • Invertebrates • These are animals without ___________. • Over _________ species of invertebrates in world. • Some examples are: • _______________ • ________________ • ________________
Vertebrates have 3 special features: Internal skeleton skull backbone
Vertebrate are divided into 7 classes: • Fish with bones (bass, trout, salmon) • Fish with cartilage (sharks, skates, rays) • Fish without jaws or scales (lampreys, hagfish) • Amphibians • Reptiles • Birds • mammals
There are about 24,000 species of fish in the world. • All fish live in water and breathe with their gills. • Most fish have skeleton of bones. • Ex: bass, trout, salmon • Bony fish covered in scales • Bony fish have swim bladder that help them move up and down in water. • Cold-blooded • Some fish have cartilage instead of bone. • They have powerful jaws and sharp teeth. • Ex: sharks, skates, rays
amphibians=“_______________” • Over 5,000 species of frogs, toads, + salamanders. • Live part of life on land, and part in water. • Adult amphibians breathe with lungs or through their skin which is thin and moist. • Cold-blooded • Tadpoles to frogs Tadpole live in water, Then grows legs, loses gills and tail, develops into frog. Frog lives on land. This is called Metamorphosis.
Reptiles • Ex: snakes, lizards, turtles, alligators, crocodiles. • About 7,000 species. • Some live in water, some on land. • Skin is scaly and watertight. • Most lay eggs on land, and the egg is soft. • Reptiles breathe with lungs. • Cold-blooded which means their body temp. changes with their surroundings.
Birds • More than 9,000 species. • Almost all can fly-except • Ostrich ----emu ---penguins • Feathers keep birds warm, provide lift for flying, and smooth their body.
Birds cont. • Have hollow bones that make it easy to fly. • Need to eat constantly because they burn up so much energy flying. • Breathe with lungs. • Lay eggs have hard shell • Birds are • warm-blooded. • This means that no matter what the temperature is inside or outside, their body temperature stays the same.
Mammals • Named for the mammary gland which produces milk for their babies. • Mammals nurse their babies. • Most mammals have hair that covers body • Most live on land, but some in water, ex: • Whales, porpoises, dolphins
Mammals cont. • All have lungs and breathe air. • Most mammals birth live babies. -bears -elephants -mice -humans • Some have babies inside a pouch, like • Opossums • kangaroos • Only a couple lay eggs, such as • Duck-billed platypus\ • Spiny anteater
What three features do all vertebrate have? • 1. • 2. • 3. • How does a trout’s skeleton differ from a shark’s skeleton? • What happens during metamorphosis in a frog? • Why are a frog’s eggs able to survive in dry places? • What 2 features do mammals have that other vertebrates do not have?