There’s a general agreement that art must have some sort of producer and some possible or intended audience. In this way, it’s similar to other forms of communication.

But the rest of the picture is unclear, and there’s no universally agreed-upon definition of art. In fact, art has proven so difficult to define that Scottish philosopher W.B. Gallie once suggested it might be an “essentially contested concept” – an idea for which there is no correct definition.

To me, a key question is whether there’s any animal art that doesn’t have to do with mating, and instead expresses something more complex or sentimental. Without being able to get into the heads of animals, it’s hard to say. But it’s plausible that humans aren’t alone in their artistic pursuits.