Mainly sharks, sardines and dolphins. It's from a nature programme called The Blue Planet, which is one of the most staggering pieces of cinematography ever created. (I reflexively typed IMHO there, but it's not just IMHO). Anyway! This bit is of a sardine swarm so big it looks like a coral reef. The sharks cut these bloody passages through the swarm. The birds dive and snatch. The dolphins leap and...you can't really see it but the dolphins totally look like they're galloping through the waves. The sardines are totally buggered, basically.

I think I could have made it better but the cramp in my hands was killing me so I thought I'd better post it to prevent myself from fiddling with it obsessively.