Premier Automne by Je Regarde.
The unfortunate death of a wild hare turns into a remarkable experience for a couple of children who find his little body. They feel obliged to solve this matter; therefore, they bury him in a playground. Once buried, the hare’s life gradually fades away and dozens of magical creatures that previously lived inside him have to abandon his body and anxiously search for a new home.
The hare’s life ends by dissolving into nature, but is reborn in various plants and living things around.