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Lom Vršany: Pyrotechnici odstřelili vysloužilý kolejový zakladač blesk.cz - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from blesk.cz Daily Mail and Mail on Sunday newspapers.
E-Mail IMAGE: A global study of songbirds like this field warbler shows that song frequencies primarily depend on body size. view more Credit: Tomáš Albrecht An analysis of the songs of most of the world s passerine birds reveals that the frequency at which birds sing mostly depends on body size, but is also influenced by sexual selection. The new study from researchers of the Max Planck Institute for Ornithology and colleagues suggests that habitat characteristics do not affect song frequency, thereby refuting a long-standing theory. Many animals use acoustic signals for communication. These signals have evolved to maximize the effectiveness of the transmission and reception of the sounds, because this helps finding a mate or avoiding predation. One of the fundamental characteristics of acoustic signals is the frequency of the sound. In forested habitats, acoustic signals become attenuated because of sound absorption and scattering from foliage, ....
AV ČR: Analýza tisíců nahrávek ptačích zpěvů přinesla překvapivé závěry | ParlamentniListy.cz – politika ze všech stran parlamentnilisty.cz - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from parlamentnilisty.cz Daily Mail and Mail on Sunday newspapers.