How do you teach a tiger the birds and the bees?

Three years ago, an innovative conservation project aimed to "re-wild" four critically endangered South Asian tigers, placing them on a preserve in Africa where they could learn to be tigers all over again.

But failures have plagued the program. One of the two male tigers died of a weak heart. Ten more tigers promised by the Chinese government failed to materialize. Plans to allow the tigers to hunt freely have been abandoned in favor of just trying to get them to breed. But that isn't working out too well, either: the tigers don't know how to breed. And there are no other tigers nearby to teach them the birds and the bees.

With less than 100 South Asian tigers in the wild and in zoos, the species has been called "functionally extinct."

Link: Failure stalks controversial bid to breed 'virtually extinct' tigers.