For decades, the signal crayfish has been an ecological troublemaker. It is invasive and widespread across Europe, Asia, and ...

Although a superpower, the U.S. is under constant invasion — we’re not talking humans here but meek-looking plants and ...

The critically endangered fish, discovered in the commercial aquarium trade, can only be found in one forest swamp on Sumatra, Indonesia.

The Okanagan crayfish found in North Central Washington and north in British Columbia is “olive brown to brick red,” ...

The status of eight fish on the list remains unchanged, and only two—the gilt darter and silver chub—are classified as ...