What’s going on in this photograph?

Baboons on the shore of Lake Tanganyika, Tanzania, by Ami Vitale for The Nature Conservancy.
What’s going on in this photograph?
Baboons on the shore of Lake Tanganyika, Tanzania, by Ami Vitale for The Nature Conservancy.
Baboons lick a lot of rocks for a tiny taste of salt deposited by lapping waves along Lake Tanganyika’s shore. This was on the The Nature Conservancy website at the bottom of the picture above.
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