The only thing you need to do is to GENTLY brush your tongue daily, as bacteria can collect in the fissures, causing bad breath. I'm enclosing a link to the couple of lines wikipedia has about it, mainly so you can see the picture there.
Quick Answer. As of 2009, there are 270 species of turtles, and more are being discovered. Turtles have been on the Earth for 230 million years and predate dinosaurs. Turtles have developed multiple habitats and live anywhere except the Arctic and Antarctic. Continue Reading.
There are some 15,000 species of protozoans, or one-celled animals, but the record for the number of different species is held by insects, with well over 750,000! The best estimate is that there are at least three million different kinds of animals on earth!