UNIT 3 ANIMALS VERTEBRATES AND INVERTEBRATES DIFFERENCES Vertebrates

UNIT 3. ANIMALS

VERTEBRATES AND INVERTEBRATES ◦ DIFFERENCES: Vertebrates have got a backbone and invertebrates do not have a backbone.

VERTEBRATES’ GROUPS Mammals birds reptiles Amphibians fish

MAMMALS I Physical characteristics -Most mammals live on land. -Most mammals have got 4 legs.

MAMMALS I ◦ Physical characteristics -Most mammals have fur to keep them warm FUR

MAMMALS I ◦ Physical characteristics CURIOSITY! -Some mammals live in water -They use flippers to move Dolphins are mammals

MAMMALS II NUTRITION Mammals can be: ◦ Carnivores: They eat other animals ◦ Herbivores: They eat grass, fruits or plants ◦ Omnivores: They eat both All baby mammals drink their mother’s milk

MAMMALS III RESPIRATION All mammals breathe with lungs.

MAMMALS Iv REPRODUCTION Almost all mammals are viviparous. Their babies are born from their mothers.

BIRDS I Physical characteristics ◦Most birds can fly ◦They have wings, tail and feathers ◦Feathers keep them warm FEATHERS

BIRDS I Physical characteristics ◦ Birds have light and hollow bones ◦ They have a beak for eating

Nutrition BIRDS II ◦ Like mammals they can be: omnivores. ◦ Adult birds feed their chicks carnivores, herbivores or

BIRDS III Respiration ◦ Birds breathe with their lungs

BIRDS IV REPRODUCTION ◦ Birds are oviparous ◦ They reproduce by laying eggs

REPTILES I PHYSICAL CHARACTERISTICS Provide them camouflaje ◦ Reptiles have scales Protect them from injury

REPTILES I ◦ PHYSICAL CHARACTERISTICS ◦ Most reptiles have arms and legs ◦ They use arms and legs to run ◦ Other reptiles swim ◦ Snakes have no legs, they slither

REPTILES II NUTRITION ◦ Almost all reptiles are carnivores ◦ Some of them are omnivores

REPTILES III RESPIRATION ◦Reptiles, like mammals and birds breathe with lungs

REPTILES IV REPRODUCTION ◦ Most reptiles are oviparous

AMPHIBIANs I PHYSICAL CHARACTERISTICS ◦ am. PHIBIANS DO NOT HAVE SCALES. THEY HAVE MOIST SKIN. ◦ Through their skin they absorb oxygen.

AMPHIBIANS I PHYSICAL CHARACTERISTICS ◦ Frogs are amphibians. ◦ The cicle of the frog: 1. Frogs lay eggs 2. Tadpoles hatch from the eggs 3. The tadpoles grow back eggs 4. They grow front legs 5. Finally, they lose their tale and move on to the land

AMPHIBIANS II NUTRITION ◦ Most amphibians are carnivores. They usually eat mosquitoes.

AMPHIBIANS III RESPIRATION ◦ Baby amphibians breathe through gills ◦ Adult amphibians breathe with lungs

AMPHIBIANS IV REPRODUCTION ◦ Amphibians are oviparous. They lay egg.

FISH i PHYSICAL CHARACTERISTICS ◦ Fish have scales like reptiles do. ◦ The scales protect them from injury. ◦ They have fins to swim. FINS

Nutrition FISH i. I ◦ Fish can be carnivores, herbivores and omnivores

FISH iii RESPIRATION Fish need oxygen. They take the oxygen from water using their gills.

Reproduction FISH iv ◦ Almost all fish are oviparous. ◦ They lay eggs under water.