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Robins Change Their Sweet Mating Tunes To War Whoops
University Park Pennsylvania State University graduate student Robert E Deck earned a Master of Science after two summers in the woods recording summary of robins warning signals using ground predators such as humans cats a stuffed raccoon and a pilot black snake and aerial predators a live red tailed hawk and stuffed hawks. The study notes robins emit high frequency short cries when danger approaches their young disturbed or near nests and a lower 2000 cycles per second call when predators near the young or other adults followed by distraction actions. Sky threats trigger a prolonged rising warning that ends when danger passes. Nestlings and nearby birds react with stillness and silence respectively.
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Robert E. Deck