User:Finsandflippers
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Fin and Flipper Locomotion
Locomotion with fins and flippers occurs mostly in aquatic locomotion, and rarely in terrestrial locomotion. From the three common states of matter - gas, liquid and solid, these appendages are adapted for liquids, mostly Fresh or Saltwater and used in locomotion, steering and balancing of the body. Locomotion is important in order to escape predators, acquire food, find mates and bury for shelter, nest or food. Aquatic locomotion consists of swimming, whereas terrestrial locomotion encompasses walking, 'crutching', jumping, digging as well as covering. Some animals such as Sea turtles and Mudskippers utilize both environments for various purposes, for example to lay their nests, or to hunt for food.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Periophthalmus_gracilis.jpg/320px-Periophthalmus_gracilis.jpg)