There has to be some, doesn't there? If you put rabbits someplace where nothing eats them soon you have way too many rabbits...
To... make sure they don't go about making more rabbits too fast.
I don't mean it literally, but how are the Valar slowing them down?
People keep bunnies at home sometimes. And other animals. Dogs and cats are most popular.
That's a lot of animals. You'd need a lot of variation in climate or a way to keep them comfortable when they'd normally get too hot under all their fur or something. And what about owls? Owls are night birds and you don't have a night.
Why are there two Trees? One that was bright and dim on a cycle would be less overwhelming.
No, but it sounds like the Noldor don't all like it being bright all the time either if they dug tunnels to avoid it.
I told you there were three people who agreed to go to Valinor? Ingwë, Finwë, Elwë? One from each of the three tribes of our people that existed by Cuivienen. The third tribe, Elwë's people, were delayed on coming to Valinor - by Elwë himself vanishing, actually. Only half of them came at all and they're currently on their island, declining to come any closer.