Triangular boxfish aren’t very good swimmers because of the fused bony plates that enclose their bodies (much like armour). But by whirling opposing fins against one another, they are able to manoeuvre in and out of small nooks and crannies. Photo courtesy KameelBad.

Been to the Aquarium lately? We’d love to see what you saw! If you have images that you’d like to share with us, join the Two Oceans Aquarium Flickr group and you could see your picture on our blog!