This month, Becky’s April Squares challenge theme is ‘Bright.’ (See more responses here.) First up I thought I’d share something very unusual, which I consider myself lucky to have seen.

You’ve probably heard of stick insects, but the stick swimming crab is a far less often encountered creature. Most crabs scuttle about on the sea floor, but swimming crabs have flattened segments on their legs, which they use to propel them through the water. But even with this different method of propulsion, swimming crabs tend to stay close to the bottom.

The stick swimming crab (Charybdis baculum) has a different approach. It heads for the bright light at the surface where it paddles along, maneuvering with its spindly legs. It will sometimes snag bits of floating debris and attach them to its body to enhance its appearance. Its goal is to look like a small, drifting haven for juvenile fishes and other marine organisms that often gather under such floating islands, which offer them some protection from predators. With the stick swimming crab, that safety is an illusion. Instead, they’re part of the crab’s lunch box, to be picked off at its leisure.

Stick swimming crabs spend most of their time at the surface, but return to the sea floor for periodic molts. This one looks like it has recently molted.

Oh wait, it’s just a stick.

Also posted in response to this week’s Friendly Friday challenge theme of “Something Learned.” See more responses here.