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
Planalto hermit be of Least Concern by BirdLife International. Planalto hermit The planalto hermit ("Phaethornis pretrei") is a species of bird in the family Trochilidae, the hummingbirds. It is found in eastern and south-central Brazil, eastern Bolivia, Paraguay, and marginally in north-western Argentina. It is usually easily recognized by its relatively large size, broad white tips to all the rectrices, and cinnamon-buff underparts and rump – the latter contrasing clearly with its tail and remaining upperparts. This is essentially a non-forest hermit, being found in a wide range of open and semi-open habitats, including Caatinga, Cerrado, and the Pantanal. It is widespread