The first known birth outside China of an extremely endangered South China tiger—there may be no more than 30 in the wild—draws both celebration and concern.
AIDS could spread faster through China's general population now that sex has overtaken drug use as the chief means of contracting the virus that causes the disease, experts fear.
In a find that may ease political and ethical concerns, two teams of scientists have made human skin cells take on many of the properties of embryonic stem cells.
Stem cells from cloned monkey embryos cause cautious optimism in scientists who say the advance may eventually lead to better human medical treatments.
More than 30,000 birds were killed by last weekend's Black Sea oil spill. Meanwhile California environmentalists are cleaning birds by hand after spilled oil there.
The commercial crocodile breeder in Australia behind the genetic mapping project says similar science has helped businesses dealing in cattle, sheep, and pigs.
British red squirrels are thriving on an island off the southern coast of England, safe from a deadly poxvirus carried by the more common North American gray squirrel.
