The Venus Fly Trap Rattle is a limited common toy that was added into Adopt Me! on September 2, 2021 as part of the gifts rotation. It could be purchased for 70 or 199 from the Small or Big Gifts. It is no longer in the current Gifts rotation, and can now only be obtained through trading.
It serves no purpose other than being a fun cosmetic item to interact with. To interact with this item, a player can click/press their screen to shake the rattle.