HIV's ancestors 'plagued first mammals'

(PhysOrg.com) -- The retroviruses which gave rise to HIV have been battling it out with mammal immune systems since mammals first evolved around 100 million years ago - about 85 million years earlier than previously thought, ...

Social animals have more social smarts

Lemurs from species that hang out in big tribes are more likely to steal food behind your back instead of in front of your face.

Madagascar lemurs top endangered primates list

In the hit cartoon film "Madagascar", the island's lemurs are a lovable bunch of extroverts, but they are also among the world's most threatened primates, conservationists warned on Monday.

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