Krill

Krill are one of the minor protagonists in Finding Nemo

Finding Nemo
In Finding Nemo, the krill are first seen swimming away from a giant whale and they all tell Marlin and Dory to swim away. Dory looks at the krill swimming away, when suddenly, the whale eats Marlin and Dory.

Trivia

 * The krill also appeared in the Finding Nemo video game, where they have deep voices instead of high-pitched voices. They follow Nemo if he swims on them, and they protect him from any danger. But when Nemo gets struck by a bad guy, the krill will all swim away from Nemo.