snakehead in the grass
The mystery of how a voracious Chinese fish got into a Maryland pond has been solved: a Hong Kong native ordered the fish to prepare a soup that was a traditional remedy for his ailing sister. She recovered prior to the fish's arrival, so he kept them in an aquarium. When they began eating too many goldfish, he dumped them in the pond, where they bred. Despite being able to drag themselves a limited distance on land, the fish and their offspring have apparently not spread to nearby waterways, and authorities are considering ways to eliminate the population.
Update: 99 baby snakehead caught in the same pond.