While this is almost lost knowledge these days, humans and other animals have always paid attention to each other to find out what is going in on around them.

While this is almost lost knowledge these days, humans and other animals have always paid attention to each other to find out what is going in on around them. The nature (or absence of) bird or animal calls or activity can tell you that there is a large predator in the area.¹ Some animal calls are even specific to the type of threat as well. It has even been proposed by some linguists that prairie dog calls satisfy enough of the requirements to be considered language.² 1: https://birdlanguage.com/products/what-the-robin-knows/ https://birdlanguage.com/products/what-the-robin-knows/ 2: https://medium.com/health-and-biological-research-news/prairie-dog-chatter-the-science-behind-a-new-language-9144ace4114f https://medium.com/health-and-biological-research-news/prair...