Siegfried and Roy have participated with others in the conservation efforts for white tigers and white lions. White lions are reportedly now extinct in the wild so their support of such conservation programs has been significant.
So I wouldn't place them in the same category as circuses whose exploitation and treatment of animals is often deplorable, which I suppose is the basis for some of the comments here.
(As for something completely whacked, where the owner might be said to have "deserved what he got" how about keeping a tiger and an alligator in a NY apt? http://www.lasvegassun.com/sunbin/stories/nat-gen/2003/oct/04/100400090.html )
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