An international wildlife conference moved to enact some of the most significant protection for shark species targeted in the fin trade and scores of turtles, lizards and frogs whose numbers are being decimated by the pet trade.

By Kathia Martínez, Associated Press

Here's the science behind how they do it.

By Jacqueline Litzgus, The Conversation

Energy company BP said it will pay to clean up the oil spill still spreading in the Gulf of Mexico, caused when an oil rig it leased exploded two weeks ago. Judy Woodruff gets the latest on the crisis from…

Which came first, the land turtle or the sea turtle? Scientists aren't sure, but a newly-discovered fossil of a 220-million-year-old turtle seems to tip the scale toward aquatic evolution, and may help explain how turtles evolved their shells.

By PBS News Hour