Unicorns of the Natural World

The narwhal surfaces... Michelle Valberg/All Canada Photos/Getty Images

While the unicorn itself is a creature of fantasy and legend, one-horned and one-tusked animals do reside in the natural world. Join Robert Lamb and Joe McCormick as they examine several extant and extinct species noted for their solitary protrusions -- including the narwhal and a certain circus unicorn.

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The Indus valley unicorn.
The Indus valley unicorn.
Leemage/UIG via Getty Images

Topics in this Podcast: biology, animals