Rabbits in the wild spend most of their days foraging for food and avoiding predators. Both activities require intelligence and cunning, and rabbits have both. Pet rabbits don't need to hunt for food, nor do most have to worry about predators, but they do need to keep their minds and bodies active to live long and healthy lives.
If you can give your rabbits a few hours a day of exercise, chasing or being chased, digging, tunneling, and foresting activities, you also want to challenge them mentally, as they can get bored quickly. While interactive toys for rabbits are not as widely available as for larger animals like dogs, cats, and horses, there are a few puzzle toys on the market that rabbits seem to enjoy.
The Teach & Treat is a treat puzzle for your rabbit or other small pet. There are three levels of play that can be used for beginning, intermediate, and advanced play. Put your bunny's favorite treats in a few of the pockets, cover them up, let her loose. The holes are about an inch in diameter and the covers are just light enough for small pets to lift.
This level requires your bunny to slide the partial cover over to get to her treat.
A similar tray with holes for treats, the Trixie Snack Board Logic Toy for Rabbits involves a snift and lift strategy to get to bits of yummies you provide. The better the treats, the faster bunny learns!
This neat toy, including the carrots, is made from chewable wood and the carrots are also chew toys. They will have to be pulled out to get to the real carrots, celery, or whatever goodies you bury underneath them. This toy comes with hardware to attach the Toss & Learn Carrot Game to your bunny's cage or playground.
This hard plastic treat ball by Wheeky has an adjustable treat hole, so you can use a variety of different size and shaped treats to attract your bunny. The ball will give him some exercise too. The Wheeky Treat Ball comes with instructions for how to train your small pet, but I'm betting it won't take much time.