From antiquity to modern times, the city has been rife with creatures that creep, slither, scurry and nest among its pillars ...

Photos show the historic reintroduction, which is part of an ongoing project to bring back a species considered locally extinct for over 40 years.

In this stretch of river, about 100 miles long, up to 200 billion fish are spawned every year, helping to make the 2,700-mile-long Mekong one of the most fish-rich rivers on the planet. Deep pools ...

A family of giant river otters was released into the Iberá National Park ... since worked to prepare and breed captive otters for release. Giant otters are social animals and typically live in ...