Fiddler crab a vital role in the preservation of wetland environments; by sifting through the sands, they aerate the substrate and prevent anaerobic conditions. Fiddler crabs live rather brief lives of no more than two years (up to three years in captivity). Male fiddler crabs use the major claw to perform a waving display as a form of female courtship. Females choose their mate based on claw size and also quality of the waving display. In many fiddler crab species, the female occupies the burrow of their mate while she lays her clutch of eggs. Research shows that the male major claw
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