This small juvenile skunk was caught by Des Plaines, Ill., homeowner Richard Kaulback. He says there have always been raccoons and opossums in the Chicago area, but this year, skunks have become prolific. Cheryl Corley/NPR hide caption

itoggle caption Cheryl Corley/NPR

A worker displays two giant African land snails. For the third time since 1966, the snails are invading the US. Bobbi Zimmerman /AP hide caption

itoggle caption Bobbi Zimmerman /AP