Kiribati announces "very significant" step at U.S. Our Ocean conference.
Social spiders have personalities that determine which jobs they'll do best for their colonies.
Clipping locks to bridges as love tokens started in Paris and spread. Is it getting out of hand?
The giant-tusked Satao, one of Kenya's most adored elephants, has been killed for his ivory—a "monumental" loss, experts say.
A new report adds more fuel to the debate over whether to lift decades-old U.S. restrictions on the export of oil.