Animals

By Nastia Arias Crestar

  
                                      ANIMALS

  The animals are divided in two big groups :

     Vertebrates: the vertebrates animals have a backbone. 
     Invertebrates : the invertebrates animals don´t have a backbone.

     Vertebrates animals are divided in five types:  

• Fishes : The fishes live into the water, breathe through gills, are oviparous and have scales in your body.
• Amphibians : The amphibians live near of the water , have four legs and some have a tail. They are oviparous.
• Reptiles : The reptiles breathe through lungs they move crawling, they are oviparous and have scales in your body.
• Birds : the birds have feathers, two wings and two legs.They are oviparous.
• Mammals : the mammals are viviparous , feed their young with milk and have hair in your body except the marine mammals like  dolphins and whales. 

       
      Invertebrates animals are divided in six types:

• Cnidarians : the cnidarians are oviparous, the are aquatics animals, they live into seas and oceans ( jellyfish, anemones and corals ) and rivers and lakes (hydra).
• Worms : the worms are oviparous,  they move by crawling and they can live six or eight months.
• Arthropods : the arthorpods are oviparous, they are divided in five types (millipedes, centipedes, arachnids, crustaceans and insects).
• Molluscs : the molluscs are oviparous, live on land and they eat organic matter.
• Sponges : The sponges are the simplest of invertebrates. Most sponges live in  the ocean, but a few are found in a fresh water. They are bag shaped and don't move.
• Echinoderms : They are only marine animals (starfish, sea urchins and sea cucumbers). They crawling on the ocean floor. All echinoderms have some type of spiny structure on the outside.
 

 

Animals are classified by their way of being born in:

VIVIPAROUS: Viviparous animals are born from the mother's gut 

 OVIPAROUS: Oviparous animals are born from the eggs

Animals are classified by their feeding in:  
CARNIVORES: Carnivorous animals eat only meat

 OMNIVORES: Omnivorous animals eat meat, fish and plants

 HERVIBORES: Herviborous animals eat only plants

FUN FACTS

• 98% of the animals on the earth are invertebrates.
• The only flying mammal is the bat.
• Frogs can breathe throught their skin.
• There are likely millions of invertebrates living in your house right now. They are called dust mites and you can't see them.
• Around 23% of all marine organisms are molluscs.
• Vertebrates tend to be much more intelligent than invertebrates.

 END