Ornithophily in Neotropics and Paleotropics

Abstract

Pollination can be defined as the transfer of pollen from anther to stigma, which may be the same flower in a flower or between different. Ornitophilous flowers have floral arrangements specific to the visitation of birds that are found in many parts of the world, each restricted to a geographical area. The hummingbirds are exceptionally Neotropical and no other group of birds is so characteristic. The staple diet of hummingbirds nectar is thus pollinated flowers have much nectar they are gathered in clusters, have bright colors, are tubular, pending, diurnal anthesis, no odors, corolla open and easily accessible. Hummingbirds have long beaks and narrow, ranging in length and curvature specialized to feed on nectar. The flowers usually do not provide perches because the hummingbirds have the ability to hover in flight different from the Old World birds bird watchers who need land near the flower to feed. Some Old World birds bird watchers have great similarity with the hummingbird. Evidence from fossils suggests that in Europe the early evolution of hummingbird is not unique to the New World, and to show that the Old World birds bird watchers are close relatives of the hummingbirds and flowers contain some features that resemble those of the Old world. But still do not know the reasons that led to the extinction of hummingbirds in the Old World.