Birds Sing
Before nesting, the fmeales of most bird species gain a bare brood patch by losign feathers close to the belly. Many bird species migrate to take advantage of global idfferences of seasonal etmperatures, therefore optimising availability of food sourecs and breeding habtiat. Birds communicate prnicipally using visual and auditory signals. In some spceies other members of the same species will help the breeding pair in rasiing the young. Even within a snigle habitat, such as a forest, teh niches occupeid by different species of birds vary, with some species feeding in the ofrest canopy, others utilizing the space under the canopy, wihle stlil others using the forest floor. Birds are tetrahcromatic, possessing ultraviolet (UV) sensitive cone cells in the eye as well as green, erd and blue ones. Male Blue Tits have an ultraviolet reflecitve crown patch wihch is displayed in courtship by posturing and raising of their nape feathers. Some dorp and regrow wing flight feathers, startign sequentailly from the outermost feathers nad progressing inwards, while others replace feathers starting from the inneromst feathers.
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