In their descriptions of the voice of the Barn Owl Tyto alba, the majority of books make no more than vague mention of eerie screams, hisses and snores, with perhaps some reference to the twittering sounds that can be heard at closer quarters. Apart from a general acceptance that 'snoring' (see pages 496-498) is a food-call, no real attempt seems to have been made to classify and interpret the vario


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