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In nature, birds of the same species in flight often form homogeneous groups for various reasons, such as to defend against predators. This behavior of birds has been observed by people since time immemorial, and is the source of the idiom ("of a feather" means "of the same plumage," that is, of the same species).
Birds (flying, soaring) – Most of the approximately 10,000 living species can fly (flightless birds are the exception). Bird flight is one of the most studied forms of aerial locomotion in animals. See List of soaring birds for birds that can soar as well as fly. Townsends's big-eared bat, (Corynorhinus townsendii) displaying the "hand wing"
Relatedly, flight calls are vocalizations made by birds while flying, which often serve to keep flocks together. [69] These calls are also used for when birds want to alert others that they are taking flight. [70] Many birds engage in duet calls—a call made by two birds at or nearly at the same time. In some cases, the duets are so perfectly ...
The following cladogram is based on the analysis by Hartman et al. (2019), which found flight likely evolved five separate times among paravian dinosaurs, two of those among Avialae (in Scansoriopterygids and other avialans). Archaeopteryx and "anchiornithids" were placed in Deinonychosauria, Avialae's sister group. [4]
A kettle is a group of birds wheeling and circling in the air. The kettle may be composed of several different species at the same time. Nature photographer M. Timothy O'Keefe theorizes that the word derives from the appearance of birds circling tightly in a thermal updraft "like something boiling in a cauldron."
The flight of some species is characterised by a distinctive "flicking" action quite different from swallows. Swifts range in size from the pygmy swiftlet ( Collocalia troglodytes ), which weighs 5.4 g and measures 9 cm (3.5 in) long, to the purple needletail ( Hirundapus celebensis ), which weighs 184 g (6.5 oz) and measures 25 cm (9.8 in) long.
Bird flight is the primary mode of locomotion used by most bird species in which birds take off and fly. Flight assists birds with feeding, breeding , avoiding predators , and migrating . Bird flight includes multiple types of motion, including hovering, taking off, and landing, involving many complex movements.
A flock is a gathering of individual birds to forage or travel collectively. [1] Avian flocks are typically associated with migration. Flocking also offers foraging benefits and protection from predators, although flocking can have costs for individual members. [2] Flocks are often defined as groups consisting of individuals from the same species.