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"The Cove", (2009) about the secret practice of commercial Cetacea (dolphins, mainly) hunting in Japan (a Metascore value == 84, fwiw).

And +1 for "Grizzly Man."

I bought the DVD after it was released, but could never bring myself to watch it. The few clips I watched were extremely disturbing for me.

The Cove was a tough watch, but necessary.