The first time I ever saw wild rabbits do this in our garden I squealed :

OMG.OMG.There’sADeadRabbitOnThe Lawn!!!

We are having an August, as opposed to an October, day today and there is lots of Bun-Bathing going on.

I’m thinking of renting out my grass by the square foot :o)

BTW : Our bunnies spread eagle themselves and lie, eyes closed, mouths open.