Piranha. So pretty. They glitter gold. Bones litter the bottom of their tank. They have a video that plays, showing a baby osprey learning to fly landing in the water, it's stripped clean in under 5 minutes. So disturbing, but you can't look away.
I have a morbid fascination with piranhas. Interestingly, there are several varieties of them, but only the red-something-or-others are the frenzied carnivores.