Did the South American Hoatzins originate in Europe?

Where did hoatzins come from? These unusual birds, only one species of which exists in South America today, originated in the Old World. Studies of the oldest known fossils of Hoatzin ancestors have now shown that these birds ...

Why bats, rats and cats store different amounts of fat

Animals differ in the amount of fat they carry around depending on their species, status and sex. However, the causes of much of this variation have been a mystery. The Bristol study shows that many differences can be understood ...

Sierra Nevada red foxes are more common than once thought

At least half a dozen Sierra Nevada red foxes, a species once believed to have been nearly wiped out in the 1920s, roam the high country wilderness south of Yosemite, U.S. Forest Service biologists said Thursday.

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