Long-tailed sylph (Aglaiocercus kingi): The males of this species sport an amazingly long tail — so long that it hampers their flight and a male has to be a particularly strong and skilled flier to survive to breeding age. Females choose to mate with males with the longest tail feathers, since the length proves the male's level of strength and fitness.
Tufted Coquette Hummingbird is a tiny hummingbird that breeds in E Venezuela, Trinidad, Guiana and N Brazil. It is 6.6 cm long and weighs only 2.3 g. It prefers open country, gardens and cultivation. It's an uncommon, but widespread species which appears to be a local or seasonal migrant, although its movements are not well understood.