Before 1935, there were no cane toads in Australia. Today, they are a huge presence in the country. In fact, scientists estimate that there are 83 toads for every person there The big amphibians--which can weigh close to three pounds--show up on highways, in watering holes meant for cattle, and in people's yards in town. Because they ooze a powerful poison when attacked, they kill many wild animals as well as pets each year. In Australia's Cane Toads:...