It may seem like a really simple thing but it’s also really important. If rabbit’s claws grow too long they can start to curl in on themselves causing pain and discomfort. Outdoor rabbits tend to do better at keeping their nails trim themselves as they have more opportunity to dig and scratch them on hard surfaces, but it is still important to check on them just in case.
If your bunnies are indoors, it may be necessary to trim their claws for them fairly regularly. Vets will usually do this for you when you bring them for their regular check-ups, but if you find they need trimmed more often than this, ask your vet to show you how to do them yourself. All you need is a good pair of small animal nail clippers.