From the AmphibiaWeb home page:
The New York Times describes conservation efforts for this Extinct in the Wild species, Nectophrynoides asperginis. This tiny toad species, which gives birth to miniscule toadlets, was discovered in 1998 living in the spray zone of a single Tanzanian waterfall.
By 2000 a dam had been constructed that cut off 90% of the water, and most of the toad population died off soon thereafter. Chytrid fungus invaded and killed many of the remaining toads. In a bid to save this rare live-bearing species, scientists airlifted some survivors to zoos, where it was touch-and-go until it could be figured out how to keep them alive in captivity. This year some may be reintroduced to the wild.