unit 2 the reptiles
TRANSCRIPT
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Vertebrate animals have a backbone.
They are classified in mammals, birds, fish,
reptiles and amphibians.
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ReptilesTurtles, crocodiles and snakes are reptiles.
Most of them are terrestrial.
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Characteristics
Their bodies have scales. http://www.youtube.com/watch?NR=1&v=CLtkB60JRkY
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Tortoises have a hard shell that protects their inside organs.
shell
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Reptiles have four limbs that are four legs.
Snakes don´t have legs and move their bodies to crawl.
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Most reptiles have teeth some used them to inject venom.
Fang
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Reptiles breathe through lungs
lungs
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Their body temperatures are not constant. Their temperatures
depend on the environment. of their environment.hotcold
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The reptiles are oviparus and they don´t incubate their eggs.
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Fertilization takes place inside the female.
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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.
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Characteristics of amphibiansCharacteristics of amphibians
Amphibians are oviparous.Fertilization takes place outside the body.
fertilization
http://www.youtube.com/watch?NR=1&v=UdelWdbrwww
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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
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Amphibians breathe through their wet skin and their lungs .
Lung
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Their bodies have no scales or hair.
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Their bodies temperature is not constant.
Cold in the water. Hot in the sun.
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Amphibians have four limbs.
Newts have tail. Frogs don´t have tails
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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.