Zebra mussels are native to the Black and Caspian Seas. They are thought to have entered North America in the early 1980s and were formally identified in the Great Lakes in 1988, followed by ...

A spokeswoman for Marwell Wildlife, which runs Marwell Zoo near Winchester, said: “Every zebra, for instance ... scimitar-horned oryx all look alike from above, but the shadows of males clearly ...