Canopy Alerts Go Viral: Cross-Species Alarm Calls Ripple Through the Amazon

Researchers in the Peruvian Amazon used trained raptors and playback to trigger predator alarms and tracked how small birds and primates relay warnings to other species within seconds, effectively creating an ‘internet of the forest.’ Small canopy birds, especially nunbirds, led the relay, with the study illustrating how alarm signals spread across species rather than detailing an actual hunt. The work adds to evidence of cross-species eavesdropping, suggesting acoustic monitoring could map signal dynamics over space and time, while noting playback limits and open questions about what exact information is carried by alarms and how forest composition affects transmission.