Catfish in France 5 ft long, eat pigeons. Birds sing higher pitched songs in open areas because dense vegetation muffles higher notes. Urban birds sing higher pitched songs. For oscines, its behavior (adjusts to conditions) whereas it may be genetic for suboscines and frogs. Their song is predetermined (not learned) so harder to adjust. Song may be shorter, more spaced out notes so echoes from buildings are reduced.
— May 22, 2020 08:16PM
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