07 April 2005, 03:43 AM ET
A new report lists the 25 most endangered primates and says several are in a grave state.
08 March 2005, 01:30 AM ET
And now the bad news: There's not much anyone can do about it.
19 January 2005, 08:20 PM ET
Heat, lack of air probably led to the Great Dying, rather than an asteroid impact.
02 December 2004, 01:30 AM ET
New evidence that the Great Dying was not caused by a space rock.
08 November 2004, 04:00 AM ET
It couldn't have been so dark and cold, a researcher says.
12 October 2004, 03:00 AM ET
Today's endangered species lists hide thousands of plants and animals that will also become extinct if their host species disappear, new research shows.