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Tricycles are used by riders with locomotor dysfunction and balance issues such as cerebral palsy or hemiplegia.

However, the diversity of locomotor behaviors in living apes and the incompleteness of the fossil record have hampered the development of a clear picture of human bipedalism's origins.

If confirmed, he notes, it would add to the small but growing pile of evidence for play in invertebrates—and would be the first instance of a type called “locomotor play” in these animals.

Intriguingly, the pattern of locomotor diversity is not limited to these early chapters of human evolution.

“The long-term decrease in the locomotor performance of autotomized males may impair mate searching,” they wrote.