Koi aren't lightweights either; they typically tip the scales around 35 pounds (16 kg), and experts advise filling a pond ...

The findings include four mammals, eight fish, three amphibians and 10 butterfly species, according to the research team. Among the newly discovered species is the "blob-headed" fish, named for ...

The U.S. Fish and Wildlife Service is proposing protection for one of the nation’s most beloved species — the monarch butterfly — and is encouraging the public to be part of its recovery.