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Enthusiasm = feigned excitment that was part of his act.
Passionate = Publicity hound.
Holding a month-old son in front of a hungry crocodile while feeding it with the other hand = Nutcase.
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Way too harsh there...
The guy started with absolutely nothing but a sincere passion for wildlife and wildlife conservation. He was in no way shape or form, a nutcase. He WAS in fact a well respected herpetologist in the scientific community, AND he was always the first to admit that - while he was a trained professional - wild animals are best left alone in their natural habitat. Given the chance to speak from beyond the grave, I'd bet the first thing he'd say would be that his death was not the fault of the sting ray, as he was in it's territory and it was only reacting to a perceived threat.
In case you were not aware, he donated every cent he made from his movie to conservation efforts in Australia.