english: Well, according to David Attenborough and some other people, birds do it too -- that the birds in the canopy, where the foliage is dense, their calls tend to be high-pitched, short and repetitive.
non_english: Pa, Dejvid Atenborou i neki drugi kažu da i ptice tako rade. Zov onih ptica u krošnjama, gde je lišće najgušće, mora da bude visok, kratak i da se ponavlja.