Cuttlefish have rounded W-shaped pupils because they live in a world of high light contrast (bright above, dim below) & this arrangement acts like a cross-shaped sun visor, normalizing brightness.
In darker environments, they become fully rounded.
(📷: Steve McNicholas, Flickr)
c0nc0rdance
Do you know an outstanding aquarist?
We're hiring a Senior Aquarist to help run our cephalopod facility at Columbia University. Our team maintains a colony of 250+ cuttlefish, develops new husbandry techniques (inc transgenics) & studies cuttlefish camouflage and social behavior. 1/3
[Pls repost!]
