Hermit crab wood and stone are used by some species). The tip of the hermit crab's abdomen is adapted to clasp strongly onto the columella of the snail shell. Most hermit crabs are nocturnal. Hermit crabs can be divided into two groups: As hermit crabs grow, they require larger shells. Since suitable intact gastropod shells are sometimes a limited resource, vigorous competition often occurs among hermit crabs for shells. The availability of empty shells at any given place depends on the relative abundance of gastropods and hermit crabs, matched for size. An equally important issue is the population of organisms that prey
Streak-throated hermit some distance along the Tapajos River corridor. It is a small hermit with a total length of approximately 9 cm, both subspecies have very pale buff-grey underparts and dark streaks on the throat. Streak-throated hermit The streak-throated hermit ("Phaethornis rupurumii"), also known as the Rupurumi hermit, is a species of hummingbird in the family Trochilidae. It was formerly considered a subspecies of the dusky-throated hermit. The streak-throated hermit is found in forest, woodland and dense shrub in north-eastern South America. It has two subspecies; the nominate subspecies is found in south-eastern Venezuela, west-central Guyana, and the extreme northern Brazil Amazon