I took one of my Ball Pythons to the vet today and the vet told me that I should use rabbit pellets (hay pressed into pellet form) as my snakes substrate. I've never heard of that being used as snake bedding so it seems odd to me which is why I'm on here getting second opinions. I trust my vet but I get paranoid sometimes. She said if it's ingested it'll just pass like normal and not harm the snake.