In the charmingly-titled article "Bullfrog explosion plaguing B.C." CBC News describes the problems British Columbia is experiencing as a result of skyrocketing populations of American bullfrogs (Rana catesbeiana). The bullfrogs were introduced to B.C. almost 80 years ago as part of a marketing scheme to provide frog's legs to the restaurant industry. Many of the frogs were released into the wild after the industry failed. Now there are concerns that the bullfrogs are endangering native frog species...by eating them!
Thanks to a member of the ALIENS-L listserver for posting a link to the story.