Multicolor Beakworm

When remaining in shallows, this creature grew and started to live in great shoals, developing an exuberant color. Its tail and dorsal fin are longer and acquired a thorn in the tip. A pair of small paddles appeared, turning its displacement in the water easier and fast. The leader of the shoal generally is the creature of more prominence in the group (stronger and colored). In case that it dies, a substitute will be chosen and will assume its place of prominence.