Furthermore, there was a strong trend that the difference between fleeing to heterospecific and conspecific alarm calls was larger when noise was played than not played (10 birds showed a greater reduction in response in noisy conditions compared to quiet conditions versus three the opposite, p = 0.092; electronic supplementary material, tables S1, S2). 4 .
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Noise constrains heterospecific eavesdropping more than conspecific reception of alarm calls.
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