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More man-made toxins, such as mercury and chemical coolants, are reaching the Arctic and are increasing in the polar bear's food sources.
Scientists discover chlorophyll-producing sea slug that can carry out photosynthesis using genes swiped from plants.
Do dogs have nationalities? Do orangutans? And if so, why? Who has the right to claim them as their own?
Scientists observe problem-solving in freshwater fish.
Endemic species are more likely to form in biologically isolated areas such as islands and large bodies of water and run a higher risk of extinction because of their geographic isolation.
Monkeys and apes think in sentences and are physically capable of talking, but they simply don’t care to converse.
Fungus-farming ant species evolved beyond the need for males within the last 1 to 2 million years, but asexual species generally don't last very long.
Video: A camera trap catches a family of rare Sumatran tigers on the move in the jungle. Msnbc.com's Alan Boyle reports.
Video: More than a dozen Chihuahuas from San Francisco fly to New York City where the American Society for the Prevention of Cruelty to Animals will help find them new homes. NBC's Lee Cowen reports.
Town of Rhys plans to use trained hawks to scare off the seagulls that have been attacking shoppers.
California group gets riled when officials bury a dead sea lion near their volleyball court.
Chimpanzees everywhere can breathe a collective sigh of relief since the Jane Goodall Institute has received a new grant that will drastically expand the group's work in Tanzania.
Video: PETA members dressed in lettuce bikinis brave the winter cold to share their message: Give up eating meat and go vegan.
What does a green dog do? MNN staffers show their dogs in action. Enter your dog now!
Newly discovered raptor may have employed venom to subdue his prey -- as if fangs and claws weren't enough.
Activist and author blogs about politics, energy and Earth's resources.
Science journalist blogs about humans and other wildlife.