Knut, the polar bear cub born in the Berlin Zoo will not be put down. We owe to Knut some of the cutest images on the web this year. He was rejected by his mother after being born and some animal-rights activists said that he should be put to sleep because that is what Nature intended (this has happened before, that baby animals are killed when rejected by their parents). The whole article here.
By the way, to me, animal-right extremists are like any other extremists. No difference to Bin Laden, in my view.