Do squirrels mourn mates

Answer 1

Whether it can be categorized as "mourning" or not, I do not know. But when you capture a squirrel in a cage, it communicates to other squirrels and other squirrels to it through high frequency sounds that are usually outside the range of human hearing. However, at times the frequency they use is just within our range of hearing and you can hear the high pitched squeals going back and forth between them. Once you hear the sound of these squeals, you will have no doubt they are communicating trouble, fear, and some sort of emotional concern, worry, or sense of helplessness or sadness.