MOSCOW — They are small as physician assistants go, about 2 inches long, and slithery. They wiggle about for a bit on Elena A. Kalinicheva's back before getting down to what they do best: sucking ...

KERI: In the wild, no animal, barring the porcupine and few others, command respect from the striped tiger. But during the monsoon, the 6-inch long leech can drive the big cat to safer areas in upper ...

For the first time, filmmakers in the forests of Borneo’s Mount Kinabalu have documented the so-repulsive-it’s-captivating behavior of a large, red, worm-guzzling predator. While it remains ...

Finding a leech on your body can be scary, but you don’t need to panic. We’ll give you simple steps that can help you calmly and safely remove a leech without any pain or complications from the bite.

A chance video by a grad student relishing her first big field trip might help resolve an argument that’s raged among biologists for more than a century. The question: Can leeches jump? Yes, at least ...