This idea is at least sixty years old. Science fiction fans recall the 1960 short story Callihan and the Wheelies by Stephen Barr:
Amanda glared at the little object on wheels - it was about the size of a rollerskate and it seemed to be considering what to do next. It turned its photoelectric scanners this way and that, waving its jointed grappling arms about. Then it appeared to make up its mind, and trundled over to a wall socket in the baseboard, plugged itself in and proceeded to recharge itself.
(A self-charging robot)
Scroll down for more stories in the same category. (Story submitted 4/19/2019)
Mechanical Horse Sculpture Gallops In Place
'Rod placed the brain inside the panel... the horse raised its head, wiggled its ears, blinked twice, gave a tentative whinny.' - Christopher Stasheff, 1969.
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Orion's 'Skip-to-M'Lou' Entry
'A lightning pilot possibly could land that tin toy without power and still walk away from it provided he had the skill to play Skip-to-M’Lou in and out of the atmosphere...'