Dolphin - Spy in the Pod
Episode 2
S1 E2:
[Season Finale] Remote-controlled spy creatures reveal dolphins as never before. Meet the orca, king of the dolphins, and discover the intimacy of its remarkable family life. Find dolphins that wear sponges on their noses, and race with the fastest dolphin in the world - the dall's porpoise. Most of the behaviour is filmed for the first time.