In Belize’s Actun Tunichil Muknal cave, a sacred Maya site, plants grow in darkness, sparking concerns about how tourism affects its fragile ecosystem.

First come the horseshoe crabs. Hoisting their round, tank-like shells, they trundle out of the Delaware Bay under the first ...

The poop, or guano, of infected birds is teeming with viruses. Out of all known influenza subtypes, all but two have been found in birds. The other two subtypes have only been found in bats.

In the 1950s a mining company tried to get rich by building a giant cableway to move bat guano from a cave and ... walking from the deserts of northern Mexico to the boreal regions of Canada ...