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taylorvich [soylentnews.org] writes:

https://phys.org/news/2023-11-sentinel-universally-understood-continents.html [phys.org]

Animals often use vocalizations to warn of nearby danger to others. While this information is generally intended for members of the same species, other species can eavesdrop on the warnings to use the information for their own benefit. Sentinels are animals that have warning calls so widely understood by others that those other species will form groups with them, relying on the sentinels to provide warnings of danger.

For example, the family Paridae, which are a group of birds that consist of chickadees, tits, and titmice, are known as sentinels because their alarm call for danger, which fittingly sounds like "chick-a-dee-dee-dee," is understood by most other bird species in their mixed-species flocks.

"Many animals form mixed-species groups, and the thought is that this is an anti-predator behavior," said Henry Pollock, Executive Director of the Southern Plains Land Trust. "There is safety in numbers, and there is a benefit to surrounding yourself with a more diverse set of eyes and ears. However, you have to be able to understand the information that the others around you give to make use of it."

Sentinel calls are so readily understood as a signal for danger that researchers wondered whether species that have never heard the call would still get the message. After a recent study found that birds in the Neotropics were responsive to unfamiliar chickadee alarm calls from North America, researchers at the University of Illinois Urbana-Champaign wanted to expand on this.

The team sought to test if bird communities across three different continents could understand calls for danger from a sentinel they had never encountered before—the dusky-throated antshrike. Antshrikes are birds widely distributed across Central and South America that often act as sentinels in their mixed-species flocks.

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