They have smooth scales and move very quickly into cracks or behind grass. We handle them gently so they don't drop their tails. They store food and water in them. One bit a friend's finger several years ago, severely interrupting his career as a classical pianist. Goannas are also called monitor lizards, especially in overseas countries.
Blue tongues are slow-moving lizards that feed on snails, ants, bugs, mice and fruit.
They have very powerful jaws. Take a piece of chalk and squeeze it with pliers to see how hard this is to do. The stumpy tail is beautiful like the blue-tongue. Its scales match up very neatly, especially near its mouth. Its head looks like its tail.