How do killerwhale get food?

They ambush things like penguins, seals and small dolphins. They charge headlong at them and either bash into them to stun or kill them, or they throw the smaller meals around to kill them. Also because of its sharp teeth it can rip and shred its enemies.
An orca gets its food by sometimes crashing on ice to get peinguins or seals but can get its food in the water.