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Wild birds impact many human activities, while domesticated birds are important sources of eggs, meat, feathers, and other products. Applied and economic ornithology aim to reduce the ill effects of problem birds and enhance gains from beneficial species. Red-billed queleas are a major agricultural pest in parts of Africa.
Some birds will respond to a shared song type with a song-type match (i.e. with the same song type). [24] This may be an aggressive signal; however, results are mixed. [23] Birds may also interact using repertoire-matches, wherein a bird responds with a song type that is in its rival's repertoire but is not the song that it is currently singing ...
The plumage of the Accipitridae can be striking, but rarely utilises bright colours; most birds use combinations of white, grey, buff, brown and black. [23] Overall they tend to be paler below, which helps them seem less conspicuous when seen from below. There is seldom sexual dimorphism in plumage, when it occurs the males are brighter or the ...
Birds have been seen as spirit messengers of the gods. In Norse mythology, Hugin and Munin were ravens who whispered news into the ears of the god Odin. [77] In the Etruscan and Roman religions of ancient Italy, priests were involved in augury, interpreting the words of birds while the "auspex" watched their activities to foretell events. [78]
The language of mathematics or mathematical language is an extension of the natural language (for example English) that is used in mathematics and in science for expressing results (scientific laws, theorems, proofs, logical deductions, etc.) with concision, precision and unambiguity.
Most Musical Birds. If you're dying to sing a duet with a bird of your own, there are so many birds out there that have strong musical abilities. Here are just a few of the bird that love to sing.
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