Ok... so we have three cats, yeah? One, Testardo, is old and spends all his time sleeping, one - named Orione - is a sweetie, always friendly and purring, one - Attila - is, as the name indicates, a complete terror. If you expect any of them to commit gruesome murder, it would be Attila, right?
Wrong.
Orione, the sweet little friendly kitty who looks always innocent, like he couldn't hurt a fly, brutally murdered a blackbird.
Wait, no, I can't sum it up like that, I have to describe what happened (or rather, what we figured out from the blood and feather trails)...
Orione went outside and caught a blackbird. So far all normal, yeah? All cats do that. But then he proceeded to drag the (still alive and struggling, as far as we could determine) blackbird inside through the (small... the cats have to literally crawl to get through it) and through a (small... Attila and Testardo both tend to get stuck in it) grate by the side of our door. Then, he dragged it to the ground floor bathroom, where he fought with it... the bird evidently managed to escape for a bit, as there were blood tracks from the bathroom to behind the stair door.
Behind the stair door is where the bird died, I'm assuming, since there were feathers and blood everywhere, even on the WALLS. Then the body got dragged down the stairs and into the basement bathroom, where Orione proceeded to play with it some more (as evidenced by the amount of feathers in that bathroom).
When I found him, he was chewing on the neck of the bird, and looked up at me with big innocent "who, me? I was just passing through, I have nothing to do with this, really" eyes. And of course I couldn't even get grumpy at him, he was too cute. I just went and cleaned up instead... cleaning half-caked blood off walls is a pain, let me tell you.
What's even more surprising is that I didn't see or notice anything, and I'm literally three meters from the stairs and the basement bathroom, and I've been sitting here for most of the afternoon. Ditto for my brother... and ditto for my mother, who was reading on the sofa on the ground floor, five meters from the cat door and grate, the stairs, and the ground floor bathroom.
So, we have a ninja cat, and we'd underestimated him. We are so doomed...

Bwhaha!
Erm.... *cough*.. I mean of course 'poor bird'...