The alternative way of cracking crabs is by banging on them with a spoon. Coconut Crab is much rarer in restaurants than the kind mentioned above. By the way, coconut crabs are interesting animals not only as a dish but also alive. They make their living climbing coconut trees where they bore holes in coconuts and scrape them out with their long pincers. In Thai and Chinese cuisine, oysters are usually steamed or grilled on the half shell after being marinated in various spices.
Oysters are comparatively cheap in Thailand.
Mussels are served steamed or in soups. Clams are more expensive. As anywhere in the world, they are most commonly served in soups. Oysters, mussels, and clams all can be prepared with a cheese and wine sauce. However, as oysters have the mildest and clams the strongest taste of the three, the sauce for oysters has to be milder, too.