Crabs make up 20% of all marine crustaceans caught, farmed, and consumed worldwide, amounting to 1.5 million tonnes annually.
Crabs are prepared and eaten as a dish in several different ways all over the world.
Some species are eaten whole, including the shell, such as soft-shell crab; with other species just the claws and/or legs are eaten. (source)
So can hamsters eat crab?
Its not great for them to eat, but a little bit wont harm them as long as it doesn’t have shell on it. If you give them too much there is a risk that they may pouch it and it may begin to smell.