Rabbits scream when they are frightened or are in pain. While some rabbits do not scream when they are dying, most rabbits will scream at least once during their lifetime. A rabbit's scream sounds exactly like the scream of a young child.
Rabbits communicate by moving and positioning their bodies in specific ways. A "dead bunny" position is when a rabbit is sleeping while lying on its back, and a pet rabbit sometimes does this when it wants a tummy rub. Rolling dog-style while playing is a common movement of young rabbits. Once a rabbit is mature, the behavior is much less common.