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,
Hermit (hummingbird) notably SACC, which consider both "T. niger" and "T. leucurus" as valid species. Additionally, Mallet-Rodrigues (2006) suggested the taxon "loehkeni" should be considered a valid species, the bronze-tailed barbthroat. Three additional species, the tooth-billed hummingbird ("Androdon aequatorialis"), the green-fronted lancebill ("Doryfera ludovicae") and the blue-fronted lancebill ("D. johannae"), have been included in this subfamily in the past, but are now placed in "Trochilinae". Hermit (hummingbird) The hermits are tropical and subtropical hummingbirds in the subfamily Phaethornithinae, comprising 30–40 species in six genera. They occur from southern Mexico, through Central America, to South America as far south as northern Argentina. Their