This video is so impressive, for a second I wondered if it's fake. But I don't think so.

Shark attacks dolphin (PG; it's not graphic)
http://www.break.com/index/sharkdolphin.html

That doesn't look like a dolphin being attacked. Plus, dolphins can outswim even the fastest shark.

The way the camera was ready for action tells me that this was a big chunk of meat off the side of the boat.

Still, the power in that white shark is amazing.

This is true Sir James, as long as the dolphin isn't sick, or dead. I don't mean to sound like a "Miss Know-It-All", but I was thinking that it might have been staged as well. "Chum thrown overboard to lure the Great White." It also looked like it could have been a small California Sea Lion, which is a staple of the Great White's diet.

I am a former divemaster, and although I've never done the "chum dive for the camera". I know of plenty of folks who have. The only honest "major" feeding frenzy that I've seen, was a day I was out doing some actual research diving on Monterey Bay with a couple of divers from the Monterey Bay aquarium and a couple of Navy SEAL guys from the Monterey Bay Language institute. We were out diving off the boat in the bay and came upon a pod of Orca's feeding on a Blue Whale carcass. It was the most violent, bloody spectacle that I've ever witnessed. Others were out on the bay that day and the violent spectacle was caught on camera, and it went out over the national media. I was still rinsing off my wetsuit and flushing out my regulator, when a tourist came up to me and told me what they had seen on TV.

I've dove in a lot of conditions, although now that I'm an old fart of 45, I choose to dive in warm water with little effort....hahaha.. I do know though, that there are many people hoping for the best dive photo, or the best "whatever" photo, and they will do whatever it is that they have to do ,to sell it.

Looking at the video again, it looks like that might have been a California sea lion pup in it's mouth, but who knows?

That's a small clip from discovery channel's shark week. I dont remember where and it is seals that the sharks feast on. They work em almost just like killer whales, right up on to the beach too.

I know that dolphin have been observed killing sharks... Apparently they surround 'em and butt them to death with their snouts. I don't remember the exact reason why, probably to protect younger or more vulnerable kin.

Yes, it generally is not a good idea to mess with mothers protecting their young, there is no reasoning with that nature. Hell hath no fury like a mother protecting their babies.

That goes double if it's a mother orca. A couple years ago there was a news film clip of one with a great white shark clamped in her jaws, shaking it like a dog killing a rat.

I'd say triple... Orca are one of only two animals on earth known to kill simply for pleasure, and one of the two known to be capable of killing an adult blue whale... The other in both cases of course being us.

Interestingly, orcas rarely (if ever), attack humans. Maybe it's professional courtesy.

Or they find us "distasteful"..