Poor hippos. Clearly they are just grumpy because they have grass stuck in their teeth, so they run after people with their mouths open.
http://i.imgur.com/XoAjq3z.webm
There's a
NatGeo thing about it.
Also,
there's this.
In fairness to great whites, though, orcas are typically about 3 to 6 tons while great whites are typically about three-quarters of a ton to a little over a ton. Even the largest great whites have barely made it to the smaller end of the orca size distribution, and the largest orcas have been nearly ten tons.
More impressive (and frankly kind of horrifying), I think, is this account of orca predation on a pod of sperm whales:
Terror in Black and White
During one of their sorties, a sperm whale is pulled away from the rosette and immediately set upon by four or five attackers. We can see several black-and-white shapes beneath the water; the group is charging at the sperm whale from all sides. Twisting their bodies and violently shaking their heads like huge hungry sharks, the killer whales try to wrench off what must be very tough flesh. The tempo of the attack picks up, as though the killer whales sense they are gaining the advantage. The sperm whale cannot survive this punishment for long.
Then, to our astonishment, two sperm whales leave the rosette formation and approach their isolated companion. One on each side, the two begin to herd the severely injured whale back to the rosette. For a time, the killer whales redirect their attack to the escorts, then retreat once again. We see this same heroic scenario several times: one or two members of the rosette invite attack on themselves in an effort to bring one of their own back into the formation. All who watch are shaken by these acts of apparent altruism.
[...]
The battle has reached its peak. Several sperm whales have been dragged away from the rosette and are being savagely attacked. One of the largest rolls slowly over on its side like a sinking ship and appears to be very near death. Then, as if on cue, a bull killer whale rushes in. He broadsides the isolated sperm whale, pushing it sideways through the water. Like an angry dog, he seizes it by the flanks and shakes it violently from side to side, then swings it around in an arc, throwing up huge sprays of water. As he jerks his head to tear off chunks of flesh, his turgid dorsal fin quivers with intensity. The actions of the female killers have been demure compared with the power exhibited by this animal.
[...]
A pod of whales that may have spent decades traveling the North Pacific together has been devastated. Instead of targeting a specific individual during the attacks, the killer whales appear to have attacked at random. As a result, every member of the herd has been injured, and all may die from wounds received this morning. One has been disemboweled, its intestines draped over its back and floating alongside. Another rolls over close to our ship; hanging from its side is a huge, yawning slab of blubber, perhaps eight inches thick and as big as a queen-size mattress. The attackers had been skinning this whale alive. The killer whales killed more this morning than they could possibly eat: hundreds of tons of flesh are left behind. We are struck by the tremendous waste. Leaving the remaining sperm whales, we silently watch them still trying, with little apparent success, to form a rosette as they disappear in our wake.
[...]
What we have seen is probably the most dramatic killer whale attack on a large whale species ever witnessed by scientists. Although it has provided new insights into the dynamics of killer whale predation, it also left many unanswered questions. For example, how important has killer whale predation been in shaping the life-history characteristics of large whales. Before witnessing this encounter, we - like others in the field - believed that sperm whales, because of their size, cooperative herd behavior, and deep-diving proclivities, were largely exempt from the pressures of predation by killer whales. Alos, why were these sperm whales so passive in the face of attack, and why did they stay together and, in some cases, risk their lives to come to the aid of others in their group. Many individuals would have escaped harm by diving and leaving their wounded companions behind.
Just as many questions remain about killer whales. What is the role of the adult male in the hunting strategy. Does he wait, like the male lion, until the females have performed the risky business of killing larger prey, then step in and use his larger size to claim the spoils? Or does he represent the power hitter who steps up to bat when the bases are loaded?
I find the behavior of the sperm whales to be particularly interesting.