Fiddler crab two weeks. Fiddler crabs such as "Uca mjoebergi" have been shown to bluff about their fighting ability. Upon regrowing a lost claw, a crab will occasionally regrow a weaker claw that nevertheless intimidates crabs with smaller but stronger claws. This is an example of dishonest signalling. The dual functionality of the major claw of fiddler crabs has presented an evolutionary conundrum in that the claw mechanics best suited for fighting do not match up with the mechanics best suited for a waving display. The internal classification of the genus "Uca" is unstable, but it contains around 100 species arranged among
Streak-throated hermit 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 Basin (especially near the lower Negro and Branco Rivers), and the subspecies "amazonicus" is found near the lower Amazon River in the river corridor in Brazil's eastern Amazon Basin, as well as upstream,