Vehicle collisions accounted for another 9% with other human causes accounting for a further 7%, the researchers reveal in the journal Animal Conservation.
Now, Japanese researchers have revealed new clues to the origin of two of them, Almathea and Thebe.
But in recent years researchers have revealed a more complex and interesting story for the Lacandon.
The DNA analysis allows researchers to reveal clear distinctions among species based on chemical differences in root metabolites.
On Wednesday, researchers revealed for the first time that ovarian tissue worked normally after being removed from a young woman, frozen and returned to her body two years later.
The researcher revealed his large size work 'Education' (Kitab at-tahsil).
As Chinese researchers reveal they have created genetically modified cows that produce "humanised" milk, we answer some of the key questions in the GM food debate.
In 2005, researchers at Purdue University revealed that honey was a catalyst to calcium absorption in animals.
In an experiment, researchers revealed that people of other races do seem to look more alike than members of one's own race.
More than a thousand researchers across six nations have revealed nearly all three billion letters of our miraculous genetic code.