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A recent study shows that some male cockatoos create their own musical tools for drumming. The drumming and rhythm seem to be an extra component made to impress the ladies. Each bird has its own distinct style. Other animals (e.g. frogs and birds) use drumming and music to communicate as well, but cockatoos can drum at a steady rhythm, with a totally unique style, for up to half an hour  — which takes quite a bit of practice.

Moreover, plenty of animals use tools, but far fewer make those tools themselves.

Among humans, a regular beat is associated with group-based activity, especially dancing. As for the cockatoos, drumming with a regular beat is a done solo.