Scientists have found that laughter is a signal of animal phylum, which is mainly reflected in mammals, especially primates, rodents, social animals and marine mammals.
The laughter of animals is different from that of us humans. Animals make their own unique sounds to express their laughter, and the volume is small enough for their peers to hear.
At present, scientists have found that apart from most mammals, there are two kinds of birds that can laugh, that is, Australian magpie and Kaya parrot.