none really just that there animals
Seagull and larger fish then it. most crabs that get eaten by seagull are on the beach shore.
Well according to Aborginal Dreamtime stories, the seagull was originally a giant flying dragon. This flying dragon was the king of the sky, anything that got in its way, was destroyed. But one day a crab accused the dragon of being stingy and not sharing the sky with other animals, this made the seagull very angry, an epic Pokemon battle broke out. The dragon played with Wingull (a seagull type Pokemon) and the crab used Paras (a crab like Pokemon). They both had direct hits and one hit knockouts!! This left the dragon and crab in confusion for forty years. Eventually the dragon responded and accepted to share the sky with the other animals. So overtime the dragon devolved into a lesser creature from the flying dragon. Now a days we call it the 'seagull' it looks similar to the Pokemon, Wingull, played by there ancestor's. How ironic.
They providestrength and support for the body.
The relationship between a hermit crab and a shell is that thy are mutualism.
One example: A sea anemone and hermit crab have a mutual relationship. The sea anemone protects the crab and the crab provides food.
It would probably suffocate in a matter of minutes, if not killed sooner.
There is none
Parasitism
The symbiotic relationship is mutualism
It is a lobster, not a crab. Use the lobster like pliers to turn the lighthouse light around. This will scare away the seagull on top of the school bell tower. (see related question)
They providestrength and support for the body.
Commensalism