Vertebrate animals have a backbone.

They are classified in mammals, birds, fish,

reptiles and amphibians.

ReptilesTurtles, crocodiles and snakes are reptiles.

Most of them are terrestrial.

Characteristics

Their bodies have scales. http://www.youtube.com/watch?NR=1&v=CLtkB60JRkY

Tortoises have a hard shell that protects their inside organs.

shell

Reptiles have four limbs that are four legs.

Snakes don´t have legs and move their bodies to crawl.

Most reptiles have teeth some used them to inject venom.

Fang

Reptiles breathe through lungs

lungs

Their body temperatures are not constant. Their temperatures

depend on the environment. of their environment.hotcold

The reptiles are oviparus and they don´t incubate their eggs.

Fertilization takes place inside the female.

Eating habits of reptiles.Depending on what they eat

Reptiles can be :

Carnivorous herbivorous

Carnivorous reptiles are the most abundant.

There are less herbivorous

Reptiles.

Characteristics of amphibiansCharacteristics of amphibians

Amphibians are oviparous.Fertilization takes place outside the body.

fertilization

http://www.youtube.com/watch?NR=1&v=UdelWdbrwww

A tadpole is born from each egg. After they come out of the egg, they change into adults.

Metamorphosis of a frogMetamorphosis of a froghttp://www.youtube.com/watch?v=5GGuEr-MQf4

Amphibians breathe through their wet skin and their lungs .

Lung

Their bodies have no scales or hair.

Their bodies temperature is not constant.

Cold in the water. Hot in the sun.

Amphibians have four limbs.

Newts have tail. Frogs don´t have tails

What amphibians eatWhat amphibians eat

Tadpoles eat aquatic plants

Amphibians change thier eating habits with age:

Adults are carnivores. They eat insects, snails and small vertebrates.