Do animals laugh?

Some do. The animals closest to us, the chimps and apes, clearly do laugh, pointing to the fact that they possess self-awareness. Orangutans also have a sense of empathy and mimicry needed for laughter, which pushes the age of human laughter to at least 12-16 million years ago, when orangutans split from the line that led to gorillas, chimps, and humans.

Mice also laugh but in sounds we can't hear. They appear to have tickling groups in which the young mice can join. These young mice enjoy the tickling orgies more than their parents.