Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 6 · Episode 2 ·
If Only They Could Speak
A report by Horizon examining animal intelligence and looking at the reasons why no other animal has matched man in mental ability.
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Episode 2 of season 6 of Horizon: “If Only They Could Speak”. Aired 1969-01-09. Watch it online free on ZapFlix.