I agree it can be fascinating, but yes, be weary. Crows can be cunning and they are of course, animals. At the end of the day, a rabbit and crow companionship is not natural, so what may seem like friendship (from one or both of their perspectives) can change. Dorian may really like them while the crows are just observing the best approach to potentially test the waters on getting him vulnerable.
I have a similar experience with Wick when I was bonding him and Fable on the balcony. A specific crow would often perch on a tree branch nearby, and every day, he’d get closer until finally he landed on the balcony fence right where Wick and Fable were. The crow was definitely watching Wick intently, and I think, had Fable not been there (who is 3 times larger than Wick and the crow), the crow probably would have come to the floor and did whatever it intended with Wick. Since we cannot know their intentions, supervision is important. Also, it only takes a second for a beak to do damage, even if it is too small to pick up the rabbit. It happened to become colder over time, so balcony dates were discontinued, but the crow did stick around at the same time each day for a few days to see if Wick would be there.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.