As their forests disappear, sloths are climbing on dangerous power lines. Veterinarians and rescue centers are developing new techniques to help.

Experts say tracking international trade and limiting biomedical use could turn the tide for Asia’s three overlooked horseshoe crab species.

For manatees and other hard-to-spot species, the answer may lie in the minute particles of DNA they leave behind as they move through their environments.

A hatchery program puts freshwater mussel benefits on center stage.