Farmer discovers woolly mammoth near Detroit

Ginseng demand boosts prices and poaching

Students revive extinct squash with 800-year-old seeds

Flea fossil may hold ancestor of bubonic plague

Which U.S. states have the most endangered species? [Infographic]

New map shows where the wild things would be

6 things to know about Earth's 6th mass extinction

Signs of blood cells found inside dinosaur fossils

Why are saiga antelope dying in record numbers?

Guarding the last male northern white rhino on Earth

Ocean of acid blamed for Earth's 'great dying'

World's cutest endangered animal photographed for first time in over 2 decades