уторак, 30. новембар 2010.

Amazing Bird migration

                                                          Northern_Pintail                   
Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular (nomadism, invasions, irruptions) or in only one direction (dispersal,
movement of young away from natal area). Migration is marked by its annual seasonality. In contrast, birds that are non-migratory are said to be resident or sedentary. Approximately 1800 of world's 10,000 bird species are long-distance migrants.

Amazing Bird of prey

   Bald eagle


Birds of prey are birds that hunt for food primarily on the wing, using their keen senses, especially vision. They are defined as birds that primarily hunt vertebrates, including other birds. Their talons and beaks tend to be relatively large, powerful and adapted for tearing and/or piercing flesh. In most cases, the females are considerably larger than the males. The term "raptor" is derived from the Latin word "rapere" (meaning to seize or take by force) and may refer informally to all birds of prey, or specifically to the diurnal group. Because of their overall large size and predatory lifestyle, they face distinct conservation concerns.

Amazing The Green Macow

                                                                        Ara-ambiguus

Costa Rica Bird Watching: The Green Macow (The Conservation Plan)

The great green macaw (Ara ambiguus) has a limited distribution in the Atlantic wet lowlands of Central
 America, from Honduras south to northern Colombia, with a small isolated population in the Pacific in Esmeraldas and Guayaquil, Ecuador. The world population is about 7.000 individuals. In Costa Rica, this species is currently limited to approximately 600 km2 of tropical very wet forest in the northern part of the country, in the border area with Nicaragua.