Scientific tests with lab rabbits that developed neurotic behaviour showed that hay was the best toy for them - it keeps them busy to have a big bundle of NICE hay (hay being so variable - riding stables or farms may have the right stuff - not usually in pet shops) Also if you put hay in a big box with litter, they will use it as a toilet - it took me 10mins to clean a double hutch last night as all the mess was in the box (I use large, underbed storage boxes from wilkinsons) and I keep the hutch floor bare as they have another box of hay for a deep bed. They are very relaxed rabbits!
The main reason they need fresh hay twice a day though is for their health - they should be eating their own body-size in hay daily! Because they sit on it and pee on it, I split this into 2 bundles morning and night, so they're never bored or without hay to nibble on. Hay keeps their guts moving better than dry food, which can lead to too many squidgy poops - and hay wears their teeth down, so they shouldn't have tooth problems unless it's genetic.
The main reason they need fresh hay twice a day though is for their health - they should be eating their own body-size in hay daily! Because they sit on it and pee on it, I split this into 2 bundles morning and night, so they're never bored or without hay to nibble on. Hay keeps their guts moving better than dry food, which can lead to too many squidgy poops - and hay wears their teeth down, so they shouldn't have tooth problems unless it's genetic.