Puerto Rican coqui frogs were accidentally introduced to Hawaii in the 1980s, and today there are as many as 91,000 frogs per hectare in some locations. What does that mean for native wildlife?

For most people, discovering a frog living in your fence post would make you feel either kind of creeped out or kind of charmed. For one guy in Australia, it was a challenge: He decided to make it the ...