A group of 20 tagged killer whales traveling at fairly rapid speed is followed as they head straight toward the summer nursery grounds of a pod of narwhal and their young.
The science team and film crew are stunned as they arrive to see the killer whales lunging at the beach, pinning the entire pod of narwhal in shallow water before devouring them all.
This article was first published by PBS.org on 19 Nov 2014.
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