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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 tail feathers are used to control flight acting as rudder and brake, only some of these feathers are as firmly attached as the bird's primaries. Contour feathers are arranged on the body of the bird in the manner of roof tiles. The tips of these feathers are waterproof and help protect the bird from the elements, while the inner parts of ...
Most bird species often blend into their environment, due to some degree of camouflage, so if the species habitat is full of colors and patterns, the species would eventually evolve to blend in to avoid being eaten. Birds' feathers show a large range of colors, even exceeding the variety of many plants, leaf, and flower colors. [48]
Helpless chicks are termed altricial, and tend to be born small, blind, immobile and naked; ... Other commercially valuable products from birds include feathers ...
The pterosaur suggests feathers emerged around 250 million years ago through the common ancestor of dinosaurs, birds and pterosaurs -- and shifts the origin of feathers to 100 million years ...
The down feather is considered to be the most "straightforward" of all feather types. [2] It has a short or vestigial rachis (shaft), few barbs, and barbules that lack hooks. [3] There are three types of down: natal down, body down and powder down. Natal down is the layer of down feathers that cover most birds at some point in their early ...
The proposal to change the names of roughly 150 bird species from across North America is ruffling feathers among ornithologists and other bird lovers as a simmering debate grows increasingly heated.
Asymmetrical wing feathers, found on all flying birds with the exception of hummingbirds, help in the production of thrust and lift. Anything that moves through the air produces drag due to friction. The aerodynamic body of a bird can reduce drag, but when stopping or slowing down a bird will use its tail and feet to increase drag.