otacust: (n.) a spy, an eavesdropper.

"In a fascinating study and one of the best examples of interspecies communication between animals, scientists observed the Sika deer eavesdropping on macaques' feeding call in order to find food!"

https://youngzine.org/news/our-earth/natures-eavesdroppers-sika-deer

Image: Langur Monkey, by Salim Virji (resized).
Source: https://www.flickr.com/photos/salim/19426196
Licence: CC 2.0. https://creativecommons.org/licenses/by-sa/2.0/legalcode

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