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Birds have feathers, wings, warm blood, two legs to walk, and can lay eggs. Around 10,000 living species of bird roam around the planet. From the South pole to Norh pole, these descendants from dinosaurs diversity is a sign of their success. Read more Reptiles (clas* Reptilia) are cold blooded and have scales or scutes covering their skin. They are four limbed an*mals and lay eggs. With the exception of Antarctica, reptiles can be found in all the continents. With more than 6,800 species of reptiles present on the earth today, crocodiles and alligators, snakes, turtles and lizards form the major group. As they are cold blooded they keep themselves There are more than 30 thousand different species of fish in the waters all over the world. All fish have gills and are cold blooded The word amphibian means two lives. This is very fitting for most amphibians, as they spend part of their lives in water and part of their lives on land. Frogs, for instance, lay their eggs in water which then hatch into tadpoles. Read more Unique characteristics of the mammal include a modified sweat gland that is used for milk production, hair, and three middle ear bones. Mammals are a diverse clas* of an*mal with approximately 5,400 species, 1,200 genera, 153 families, and 28 orders. They range in size (largest an*mal to have ever existed). For some other interesting facts about mammals, see the bottom of this page. Click on the Estimated to be about 300 thousand species of plants, these living organisms get their energy from sunlight through photosynthesis. Before any an*mal walked on the land, plants had already grown there. About 500 million years ago during the Devonian period, the first If you have any questions, comments, or suggestions, please feel free to contact us at the contact form