Hermit crab gives rise to the popular name "hermit crab", by analogy to a hermit who lives alone. Several hermit crab species, both terrestrial and marine, have been observed forming a vacancy chain to exchange shells. 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,
Straight-billed hermit Straight-billed hermit The straight-billed hermit ("Phaethornis bourcieri") is a species of bird in the family Trochilidae, the hummingbirds. It is found in the Guyanas of Guyana, Suriname, and French Guiana; also the northern Amazon basin of Brazil, and Amazonian Colombia, Ecuador, and Peru; it is in eastern Venezuela and the Orinoco River Basin. Its natural habitats are subtropical or tropical moist lowland forest and subtropical or tropical moist montane forest. Two subspecies are currently recognised: "P. b. bourcieri" and "P. b. major". However, recent molecular analysis has shown that "P. b. major" is more closely related to "Phaethornis philippii" and