There are two possibilities to why that happened.
~ Aggressive behavior ~
Ferrets are known to be aggressive and for biting a lot. It's recommended to keep the ferrets away from children and small mga hayop until the ferrets have been trained how to behave around them. The ferret can ipakita aggressive behavior out of fear, stress or they simply were born aggressive. However, if Frank had been born aggressive, he would've shown aggressive behavior towards everyone, not just the rabbit.
~ Hunting ~
Ferrets from a special kind of breed aren't aggressive at all, but are natural hunters. It's in their blood to hunt.
Why I'm mentioning this? Because ferrets are commonly used for RABBIT HUNTING.
You can read about this here under the "Ferreting" section;
link Ferrets naturally despise rabbits. It's recommended to keep these two mga hayop as far away from each other as possible since they naturally can't get along.
Another thing to keep in mind is that rabbits are extremely sensitive. Rabbits can get a heartattack just from being close to a ferret. The ferret doesn't have to attack or ipakita aggressive behavior to scare them.
A person doesn't need to have personal experience to know about this. The ferrets' aggressive behavior and use for rabbit hunting are basic facts about ferrets that all ferret owners must be aware of before buying a ferret. Didn't you check ferrets up before getting one?
