Invasive Species

A type of freshwater algae, known as "rock snot," that infiltrates river bottoms and clumps on rocks is not an invasive species introduced into waterways by humans, a new study finds.

Didymo, also known as "rock snot," is a type of freshwater algae that clumps on rocks and invades river bottoms.

Alien species become invasive when their introduction to an ecosystem ends up causing ecological disruption in their new home.

Introduced species pose one of the greatest threats to Australia’s fauna and flora, but expensive efforts to control them aren’t working.

Most snakes have poor navigational capabilities, but the Burmese python can navigate home after being transported more than 20 miles away, using an internal map and compass.

Invasive, plankton-slurping Asian carp are creeping up the Mississippi River. Ready-to-hatch eggs of the fish were discovered as far north as Lynxville, Wisc.