Moray eels have no pelvic fins, which lets them have the ability to tie their bodies in knots and use this to gain leverage when tearing food. This also means that moray eels use anguilliform swimming, which is a form of swimming in which flexible fish swim by flexing the whole body into lateral waves. This is used to great effect when the eels dart forward out of a crevice to seize prey (invertebrates and fishes). They can swim nearly as well backward, which is handy for entering into the shelter of a crevice or hole to avoid predators.
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