response: There are some crustaceans that have soft abdomens, though others have hard ones.
original_response: Yes, I caught them myself. It was not difficult to do. Hermit crabs have a spirally curved abdomen, which is quite soft.
history: Hi! Do you like fishing? No, as a bot, I can't fish. However, did you know catching animals like mollusks and crustaceans is also considered fishing? Where can you catch mollusks, the ocean? To be honest, I don't have that information here right now. Have you ever heard of aquaculture? It's the act of raising fresh or saltwater creatures under controlled conditions. No, but that's pretty cool! What else do you know about fishing and such? Well, I know about fishkeeping, which is the hobby of keeping fish in aquariums or ponds. What kinds of fish can be kept as pets? Well, marine animals can be kept in a marine aquarium. Would you like to know more? Do you know what kind of creatures are marine animals?
knowledge: Most species have long, spirally curved abdomens, which are soft, unlike the hard, calcified abdomens seen in related crustaceans.