
Larval Squid
Photograph by David Liittschwager, National Geographic
This larval squid, seen in a Hawaiian laboratory, is largely transparent but boasts patches of bright color. Squid skin is full of pigment cells, which the animals can control by flexing and relaxing the muscles around them. Some squid use this ability to change colors quickly when threatened, feeding, or mating and can even adopt striped or rippled hues.