They can't breed naturally; but some sick scientists decided to genetically manipulate one (which will of course be valuable and create it's own twisted market, like ligers.)

I've seen interspecies relationships in close quarters, and sometimes love and caring doesn't care about differences!  I have a live wild bunny who for years has spent every minute of the day with a small statue of a bunny I put in the front garden (the wild bunnies live under my shed in the backyard close to the creek, but not this one.)  If I move the statue to garden, he stays nearby until I return it, then makes sure I haven't hurt it.  It's very sweet.  I regularly find bunny babies who have gotten hurt (I also have hawks in the backyard), and bring them in to be patched up, splinted or vet trips as required.  My big neutered cat Cooper promptly mothered a battered kitten I took in (Brownie, now 8), and takes over with the bunnies, making sure 'his' new baby eats, goes to the litter box, grooms and mothers him until he's ready to rejoin his family in the backyard.  Mr. Cooper knows when they're ready to be released, and will watch through the bay as I let them go and he 'brrs' to the as they go under the shed.  He watches the deer and bunnies all the time from the back bay window, and when he sees one of his babies, he 'brrs' at me until I come and admire it and tell him he's the best bunny mum a human could ask for! One year he saw a little doe, and for several years would watch the deer silently except when his Miss Dear Doe made an appearance.  She'd come over to the bay to say hi and sniffle at him, and he'd 'brrr' to her  After about an hour of this, she'd rejoin her family at the apple or hazelnut trees, and he'd watch intently.  I had to tell him that if she could get through the downstairs doggie door she could stay, but he was going to stay an inside cat.  He got over it as it clearly wasn't meant to be (she met a buck and brought her new family over, but they stayed friends.)  There's also a nightly conversation between Cooper and a possum that comes onto the carport to talk to him at the glass doors; 10pm sharp for about an hour....