Nerve-wracking footage of orcas hunting a seal

Fair warning: This footage isn't for the faint of heart! BBC's Frozen Planet II used a drone to capture the tactics a pod of orcas deployed to get their prey, a lone seal on a big chunk of ice. They report that, "only around 100 orcas in the world use this remarkable technique."

Screengrab: BBC Earth / YouTube

(Nag on the Lake)