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Despite much research on mimicry, little is known about the ecology of dynamic mimetic signals involving mimicry of multiple species. Some of the most conspicuous examples of phenotypically plastic mimicry are produced by oscine passerines, where vocal production learning enables some species to mimic multiple models and flexibly adjust what they mimic and when. While singing from a perch, male superb lyrebirds (Menura novaehollandiae) accurately imitate multiple songs and calls of over 20 species of bird. However, at key moments within their multimodal displays performed on display arenas on the forest floor, males mimic a small number of mobbing-alarm calls creating the acoustic illusion of a mixed-species mobbing flock (‘D-song’). Using observations from camera footage and a field-based playback experiment, we tested six hypotheses for alarm call model selection within D-song. Mimicked species were remarkably invariant, with 79% of D-song made up of imitations of just three diff ....
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Bypassing south korea altogether. if that feeling is here, is there also growing support for south korea to say hey we need to take our security into our own hands. there are rumblings here in certain sectors of the population calls for their own nuclear weapons. this is not possible for south korea. they re a signatory to the, tnc. but there are calls for their own nuclear weapons or bring nuclear weapons back into south korea. you re a south korea watcher and an avid north korea watcher. we know that kim jong-un, even though he s making these threats, for him it s survival of his regime. so does that offer a glimmer of hope that he can be deterred. we have to take that into account. ....