From the eBay description:
When wound, the rabbit hops up and down as he shakes the maracas and his ears go up and down. He is covered with real rabbit fur and has glass eyes. His maracas are replacements that are made of hard plastic just like the original ones were, but they have been painted to simulate the originals (the one original maraca that still remains is included in the auction but is no longer attached to the toy, as you can see it is laying next to the rabbit in the last two photos). Though the replacement maracas are not original to the toy, they do make noise just like the original maracas would have and are just slightly smaller than the originals. The rabbit's fur is quite dingy from age and has been patched up here and there, but he still looks pretty good and is very amusing to watch! The rabbit measures just over 10" tall to the top of his head (ears laying out flat), and his ears are over 4" long!
Here is the full eBay listing with a ton of photos of this Roullet & Decamps rabbit with maracas automaton.