The largest bird to ever take flight was Argentavis magnificens with a length of over 3 m(10 ft) and weight of 80 kg (175 lb)!
Largest prehistoric animals
Prehistoric birds are various taxa of birds that became extinct before recorded history, or more precisely, before they could be studied alive by ornithologists. They are known from subfossil remains and sometimes folk memory, as in the case of Haast's Eagle from New Zealand.
Birds (Aves) are generally believed to have evolved from feathered dinosaurs, and there is no real dividing line between birds and dinosaurs except of course that the former survived the Cretaceous–Paleogene extinction event and the latter did not. For the purposes of this article, a "bird" is considered to be any member of the clade Neornithes, that is the bird lineage as exists today. The other lineages of the Aves also became extinct at the end of the Cretaceous.
The largest prehistoric organisms include both vertebrate and invertebrate species. Many are described below, along with their typical range of size (for the general dates of extinction, see the link to each). Many species mentioned might not actually be the largest representative of their clade due to the incompleteness of the fossil record and many of the sizes given are merely estimates since no complete specimen have been found. Especially their body mass is mostly conjecture because soft tissue was rarely fossilized. Generally the size of extinct species was subject to energetic and biomechanical constraints.
Birds of prey
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Birds of prey, also known as raptors, are birds that hunt invertebrates and vertebrates including other birds. The term "raptor" is derived from the Latin word rapere (meaning to seize or take by force). They are characterized by keen vision that allows them to detect prey during flight and powerful talons and beaks. Because of their predatory nature they face distinct conservation concerns. In most cases, the females are larger than the males.