【英语时差8,16】伪装大师—乌贼（上）（在线收听）

Clever cephalopods and colorblind camouflage champions—cuttlefish! Cuttlefish are cephalopods, relatives of squid and octopuses, and are masters of camouflage. Using unique skin pigment cells, cuttlefish can rapidly change their skin color and pattern to blend in with the background. Amazingly, they do this despite being totally colorblind! Color-sensing cells in the retinas of cuttlefish eyes are composed of only one type of cone cell. Humans have three different types, each sensitive to a different color of light. With only one cone type, you couldn’t differentiate between different colors. Using night-vision video, scientists at Woods Hole Marine Lab also discovered that cuttlefish even match their background at night, when there isn’t enough light for color vision. This suggests that it isn’t necessary for the cuttlefish to see colors in order to match them.