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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.
What does a green dog do? Check out the contestants. Enter your dog now!
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.
Video: Lab-raised mussels are released into wild streams with hopes to increase their population.
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.
Read the official rules for the Green Dog of the Year contest.
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.
Video: 11-year-old Austin Forman shares how his dog Angel saved his life from a cougar attack. The 'Today' show reports.
Annual migration past St. Simons Island reinforces the need to protect the species from motor boats, other threats.
Activist and author blogs about politics, energy and Earth's resources.
Science journalist blogs about humans and other wildlife.