aquatic

Berlin Zoo shut its doors to visitors Friday after one of its aquatic birds tested positive for avian flu, the facility said.

In addition to affecting water quality, soils are essential for plant development

One of the important functions of a river is to remove pollutants that can end up in the water

An oil slick off the coast of Thailand continued to expand Friday and was approaching beaches on the east coast, home to fragile coral and seagrass, officials said.

Scientists have discovered the ultimate case of regeneration: Some decapitated sea slugs can regrow hearts and whole new bodies.