Hermit crabs are unusual because their bodies are not totally protected by a shell. They steal other creatures' shells to keep themselves safe.

The crab, from the Blue Reef Aquarium in Newquay, was on the lookout for a new shell, so the aquarium presented him with a man-made glass one.

"He's showing a keen interest in the new shell and we reckon he'll swap over in a day or so," aquarium staff said.

"Crabs are always on the lookout for a better shell and, from his point of view, the glass version clearly looks more attractive."