SAN DIEGO, Dec. 11 (UPI) -- A U.S. study suggests range maps that incorrectly estimate the distribution of birds have overstated the actual population of threatened species.

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SAN DIEGO, May 1 (UPI) -- A U.S. study has confirmed what biologists have long observed -- most lizards live on islands than on the mainland. The University of California-San Diego study also signals an alarm, suggesting climate change might have devastating consequences for lizar

SAN DIEGO, March 20 (UPI) -- A German-U.S. team of biologists has produced what is called the most extensive global map of plant biodiversity ever issued.

BOULDER, Colo., Oct. 7 (UPI) -- A series by UPI examining the human relationship to the natural world. This week: It should not surprise anyone to learn that large wild animals require large spaces, but new research indicates those animals need not occupy as much range as predicted simp