"March of the Penguins" more than a bit much, then definitely check out Werner Herzog's "Grizzly Man".
Therein one "Timothy Treadwell" a well-meaning bear-activist spends six months out of the year living among Alaskan grizzly bears trying to save them from poachers and their ilk. Over the course of some 13 Years Tim began to believe he was living among people, took no firearms into the wilderness, convinced his girlfriend to come along and then one day in October 2003 he and Amie Huegenard were eaten by an aging starving grizzly.
Before the iron law of irony caught up with him, Tim shot 100 hours of sumptuous video footage of the bears that represents Tim's legacy. Th camera also catches Tim in a virtual fugue state of fury, ranting at the National Park Service, the Fish and Wildlife Service and whatever seems to irk him that day on a far off Alaskan shore.
Tim was, sad to say, completely crazy....he lived among wild animals with little personal protection and took his girlfriend along for the ride getting her killed in the process.
Was he passionate?
Do bears and sundry endangered species desperately need passionate advocates?
Hell yes now more than ever.
But Tim? I think Tim thought he was a sort of Peter Pan of the Bears...one of them so to speak.
But unlike Pan the beastie got him.
Its a sad film in many ways...Tim was an American Original but like many eccentrics, paid the price in madness.