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2. Bird vocalization - Wikipedia

   en.wikipedia.org/wiki/Bird_vocalization

   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 ...

3. Ornithology - Wikipedia

   en.wikipedia.org/wiki/Ornithology

   The use of field glasses or telescopes for bird observation began in the 1820s and 1830s, with pioneers such as J. Dovaston (who also pioneered in the use of bird feeders), but instruction manuals did not begin to insist on the use of optical aids such as "a first-class telescope" or "field glass" until the 1880s.

4. List of birds of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_birds_of_the...

   In total, the list of birds in the article includes bird species found in the 50 states, the District of Columbia, and all U.S. territories. The source for birds in the U.S. territories is the Avibase website: Bird checklists of the world (American Samoa), [6] Bird checklists of the world (Guam), [3] Bird checklists of the world (Northern ...

5. Accipitridae - Wikipedia

   en.wikipedia.org/wiki/Accipitridae

   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 ...

6. Language of mathematics - Wikipedia

   en.wikipedia.org/wiki/Language_of_mathematics

   Use of common words with a derived meaning, generally more specific and more precise. For example, "or" means "one, the other or both", while, in common language, "both" is sometimes included and sometimes not. Also, a "line" is straight and has zero width. Use of common words with a meaning that is completely different from their common meaning.

7. Demonic dad allegedly beheads 1-year-old son with knife after ...

   www.aol.com/demonic-dad-allegedly-beheads-1...

   A demonic California dad has been arrested for allegedly beheading his 1-year-old son Friday in an early-morning frenzy of violence that also injured his wife and her mother, according to police.