A Murder of Crows Preview

Preview: Season 29 Episode 2 | 30s

Crows do not have the best of reputations, but new research has shown they are among the most intelligent animals in the world, able to use tools and recognize each other's voices and 250 distinct calls. "A Murder of Crows" premieres Sunday, October 24, 2010 (check local listings).

Aired: 10/23/10

Rating: NR

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