Comparison of bird beaks, displaying different shapes adapted to different feeding methods. Not to scale.
The beak, bill, or rostrum is an external anatomical structure found mostly in birds, but also in turtles, non-avian dinosaurs and a few mammals. A beak is used for pecking, grasping, and holding (in probing for food, eating, manipulating and carrying objects, killing prey, or fighting), preening, courtship, and feeding young. The terms beak and rostrum are also used to refer to a similar mouth part in some ornithischians, pterosaurs, cetaceans, dicynodonts, anuran tadpoles, monotremes (i.e. echidnas and platypuses, which have a beak-like structure), sirens, pufferfish, billfishes and cephalopods.
Although beaks vary significantly in size, shape, color and texture, they share a similar underlying structure. Two bony projections – the upper and lower mandibles – are covered with a thin keratinized layer of epidermis known as the rhamphotheca. In most species, two holes called nares lead to the respiratory system.
beak, bill, or rostrum is an external anatomical structure found mostly in birds, but also in turtles, non-avian dinosaurs and a few mammals. A beak is...
Crossed beak, also known as cross beak and scissor beak, is a congenital deformity in birds, particularly poultry, where the upper and lower parts of...
Beak 3 (stylized as >>> or Beak>>>) is the third studio album by British band Beak. It was released on 21 September 2018 under Temporary Residence Limited...
Beak 2 (stylized >> or Beak>>) is the second studio album by the British band Beak, released on 2 July 2012. Matt Williams — guitars, organ, synthesizers...
Debeaking, beak trimming (also spelled as beak-trimming), or beak conditioning, is the partial removal of the beak of poultry, especially layer hens and...
had glass openings for the eyes and a curved beak shaped like a bird's beak with straps that held the beak in front of the doctor's nose. The mask had...
from the Latin word aquilinus ("eagle-like"), an allusion to the curved beak of an eagle. While some have ascribed the aquiline nose to specific ethnic...
2024) Beak of Putrefaction split with Longmont Potion Castle (2004) Bird Seeds of Vengeance split with Caninus (2005) The Thing That Should Not Beak split...
Psittacine beak and feather disease (PBFD) is a viral disease affecting all Old World and New World parrots. The causative virus—beak and feather disease...
Major General Daniel Marcus William Beak, VC, DSO, MC & Bar (27 Jan 1891 – 3 May 1967) was a British Army officer and an English recipient of the Victoria...
The Beak of the Finch: A Story of Evolution in Our Time (ISBN 0-679-40003-6) is a 1994 nonfiction book about evolutionary biology, written by Jonathan...
Beaked whales (systematic name Ziphiidae) are a family of cetaceans noted as being one of the least-known groups of mammals because of their deep-sea habitat...
sepals. Subspecies Chloropyron molle subsp. hispidus, the hispid bird's beak, grows in alkaline and saline soils of marshes and 'playas' (a local name...
The beak of the toco toucan is integral to their vital social, feeding, foraging, and nest building behaviors. Since the toucan beak does not fully regenerate...
have the distinctive red-orange beak seen in adult birds until they are almost fully mature. On hatching, their beaks are grayish-black and they do not...
America. It is known by the common names saltmarsh bird's beak and Point Reyes bird's beak, depending on the specific subspecies. It was formerly classified...
Two species were described as recently as 1991 (pygmy beaked whale) and 2002 (Perrin's beaked whale), and marine biologists predict the discovery of...
The Turtle Beak mansion (觜宿, pinyin: Zī Xiù) is one of the twenty-eight mansions of the Chinese constellations. It is one of the western mansions of the...
All extant cephalopods have a two-part beak, or rostrum, situated in the buccal mass and surrounded by the muscular head appendages. The dorsal (upper)...
Beak Street is a street in Soho, London, that runs roughly east–west between Regent Street and Lexington Street. On its south side, Beak Street is joined...
Harvey Beaks is an American animated television series created by C. H. Greenblatt for Nickelodeon. The series follows a friendly blue bird named Harvey...
Robert Michael Cawthorn Beak OBE (1925 – 13 January 2018) was an Anglican bishop. Beak trained at the London Bible College, was ordained deacon in 1953...
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