寄居蟹

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As the hermit crab grows in size, it must find a larger shell and abandon the previous one. Several hermit crab species, both terrestrial and marine, have been observed forming a vacancy chain to exchange shells.[8] When an individual crab finds a new empty shell it will leave its own shell and inspect the vacant shell for size. If the shell is found to be too large, the crab goes back to its own shell and then waits by the vacant shell for up to 8 hours. As new crabs arrive they also inspect the shell and, if it is too big, wait with the others, forming a group of up to 20 individuals, holding onto each other in a line from the largest to the smallest crab. As soon as a crab arrives that is the right size for the vacant shell and claims it, leaving its old shell vacant, then all the crabs in the queue swiftly exchange shells in sequence, each one moving up to the next size.[10] Hermit crabs often "gang up" on one of their species with what they perceive to be a better shell, and pry its shell away from it before competing for it until one takes it over.[11] There are cases when sea shells are not available and hermit crabs will use alternatives such as tin cans or any other types of debris or even custom-made shells.


维基上看到的, 很有意思.   机器翻译:


随着寄居蟹的大小增长，它必须找到更大的贝壳并放弃前一个。已经观察到几种寄居蟹，无论是陆地的还是海洋的，都形成了一个空缺链来交换贝壳。[8]当单个螃蟹找到新的空壳时，它将离开自己的壳并检查空壳的大小。如果发现壳太大，螃蟹会回到自己的壳上，然后在空壳旁等待长达8个小时。当新的螃蟹到达时，它们还会检查外壳，如果壳太大，则与其他螃蟹一起等待，形成一个由多达20个人组成的小组，从最大到最小的螃蟹排成一行。螃蟹一到空壳大小合适的螃蟹到来并声称拥有它，而旧壳空了，然后队列中的所有螃蟹便迅速依次交换壳，每只螃蟹都向上移动到下一个大小。[10]寄居蟹常常以他们认为是更好的壳而“聚拢”在其一个物种上，并在争夺它之前将其壳撬离它，直到有人将其接管。[11]在某些情况下，没有可用的贝壳，寄居蟹将使用锡罐或任何其他类型的碎片甚至定制贝壳等替代品。