The olm (Proteus anguinus) is a very unusual animal: a large cave salamander, with an extraordinary life and an interesting history of research, that comes in (at least) two very different forms: the white olm and the black.

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

Modified versions of:

Ah by Mystery Mammal, CC BY 4.0.

Disintegration and Silent Turmoil by Myuu, CC BY 3.0.

They Call It Nature and Raise Your Hand If You Think Evil Is Increasing In This World by Chris Zabriskie, CC BY 4.0

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