Here's why:
* Space: A hutch needs to be big enough for the rabbits to move around comfortably. A general rule of thumb is to provide at least 4 square feet of floor space per rabbit.
* Socialization: Rabbits can be territorial. If you introduce them to each other at a young age and they get along well, they may be fine sharing a hutch. However, adult rabbits, especially unfamiliar ones, might fight.
In conclusion: It's not generally recommended to put 3 rabbits in a single hutch unless it's very large and you're sure the rabbits are compatible. It's better to err on the side of caution and provide them with plenty of space and separate hutches if necessary.