Search results
Results from the WOW.Com Content Network
Measuring the culmen. The upper margin of the beak or bill is referred to as the culmen.The measurement is taken using calipers with one jaw at the tip of the upper mandible and the other at the base of the bill (at the junction with the skull, a measurement called "total culmen") or where the feathers begin (a measurement called "exposed culmen").
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.
A culmen is a top, a summit or a culminating point. It may also refer to: Culmen (bird), the upper ridge of a bird's beak; Culmen (cerebellum), a structure in the brain
The colour of a bird's beak results from concentrations of pigments—primarily melanins and carotenoids—in the epidermal layers, including the rhamphotheca. [39] In general, beak colour depends on a combination of the bird's hormonal state and diet. Colours are typically brightest as the breeding season approaches and palest after breeding. [40]
Main page; Contents; Current events; Random article; About Wikipedia; Contact us
The casque has been hypothesized to serve as a visual cue to a bird's sex, state of maturity, or social status; as reinforcement to the beak's structure; or as a resonance chamber, enhancing calls. [4] In addition, they may be used in combat with other members of the same species, in the gathering of food, or in thermoregulation.
Beak#Culmen; This page is a redirect. The following categories are used to track and monitor this redirect: To a section: This is a redirect from a topic that does ...
Its beak is broad and stout, with a strongly curved culmen. Males have upper parts which are olive-colored, with underparts that are whitish, with smudgy streaking on the lower breast and flanks; some birds show rufous on the underparts. Their lower flanks and undertail coverts are buffy, with a black hood, throat, breast and upper flanks.