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The span between precocial and altricial species is particularly broad in the biology of birds. Precocial birds hatch with their eyes open and are covered with downy feathers that are soon replaced by adult-type feathers. [17] Birds of this kind can also swim and run much sooner after hatching than altricial young, such as songbirds. [17]
The call varies between individual Carnaby's black cockatoos, and older nestlings can distinguish their parents' calls. Saunders labelled a variant of the wy-lah as the interrogative call—it is drawn out and ends with an inflection. Birds often utter a soft chuck call when alone. Females make a whistling call composed of two notes of varying ...
A bird hybrid is a bird that has two different species as parents. The resulting bird can present with any combination of characteristics from the parent species, from totally identical to completely different. Usually, the bird hybrid shows intermediate characteristics between the two species.
Wood. With big fluffy plumes on the tops of their heads, Wood ducks are distinct among many other breeds. But what really sets these birds apart is the unique profile of the female duck, which ...
Female birds are able to produce more of a certain gender of birds that are more likely to survive under extreme conditions. In birds, the females' egg determines the gender of the offspring, not the male's sperm. In zebra finches, a study showed the effect of food on gender ratio production. For females, egg production is a metabolically ...
Our network analyzed over 500 photographs of bird species provided by the Macaulay Library at the Cornell Lab of Ornithology, whose extensive media collection helps researchers identify and study ...
Feathers, being critical to the survival of a bird, require maintenance. Apart from physical wear and tear, feathers face the onslaught of fungi, ectoparasitic feather mites and bird lice. [171] The physical condition of feathers are maintained by preening often with the application of secretions from the preen gland. Birds also bathe in water ...
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