What is the biological advantage of expressing sadness by leaking liquid from the eye sockets (crying) and why do some animals also do that?

Question

What is the biological advantage of expressing sadness by leaking liquid from the eye sockets (crying) and why do some animals also do that?

In: 51

Answer 1

Also, I’ve read before that it’s a visual sign of distress, so as to not alert predators that could take advantage of you not being at 100%.

Your social group sees that you need attention without making loud sounds.