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Birds respond to other species' alarm calls by also alarming, not by staying silent. This contagious alarming behavior is influenced by a species' agility and predation risk, showing how animal communities share threat information.

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Area of Science:

  • Behavioral Ecology
  • Bioacoustics
  • Community Ecology

Background:

  • Animals often eavesdrop on heterospecific alarm calls to detect predators, gaining survival benefits.
  • The precise mechanisms and drivers of responses to heterospecific alarms remain unclear.
  • Potential responses include acoustic suppression (silencing) or acoustic stimulation (alarming).

Purpose of the Study:

  • To investigate how birds respond acoustically to heterospecific alarm calls.
  • To determine if responses involve acoustic suppression or stimulation.
  • To test if species-specific traits influence reactions to heterospecific alarms.

Main Methods:

  • Playback experiments using alarms from 14 forest passerine species.
  • Comparison of acoustic behavior after alarm call playbacks versus silent controls.
  • Analysis of how species' escape ability, predation risk, and alarm call acoustics affected responses.

Main Results:

  • Birds increased alarm calling frequency after heterospecific alarm playbacks.
  • Responses involved using typical conspecific alarm calls, not suppressing vocalizations.
  • Acoustic stimulation was higher in agile species with lower predation rates.

Conclusions:

  • Birds exhibit contagious alarming, perceiving threat from heterospecific calls and joining alarm bouts.
  • Response intensity is linked to predation risk and escape capabilities, not just acoustic detectability.
  • This interspecific communication highlights community-level information sharing and potential costs of alarm responses.