how do animals other than humans know when something else is a live animal?

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I’ve noticed animals always know which other thing is the live animal and which are the inanimate objects. They can also understand when something is now dead… but how? Smell? Movement?

In: Biology

There are 5 signs of life I learned in high school biology.

Homeostasis.
Reproduction.


and Response to stimuli.

Things that are living, in addition to the two features of life I mentioned and the two I did not mention, respond to stimuli.

Source: 9th grade biology from the Deep South in the early 00s

They’ve simply become extremely good at recognising other living creatures around them through evolution because it’s necessary to know how to do that if a species wants to survive.