Nature

It sounds like a horror movie: Biting ants invade by the millions. A camper's metal walls bulge from the pressure of ants nesting behind them. A circle of poison stops them for only a day, and then a fresh horde shows up, bringing babies. Stand in the yard, and in seconds ants cover your shoes. It's an extreme example of what can happen when the ants — which also can disable huge industrial plants — go unchecked. Controlling them can cost thousands of dollars. But the story is real, told by someone who's been studying ants for a decade.

Authorities in a state in Brazil's northeast are scrambling to take the fright and the bite off the beach after piranhas sunk their teeth into about 100 beachgoers, UOL Noticias reported.

Wildlife officials in New York may ban captive boar hunts as they try to curb a growing feral hog population before it gets as bad as it is in Southern states, where roaming droves have devastated crops and wildlife habitat with their rooting, wallowing and voracious foraging.

A rapidly strengthening Hurricane Irene roared off the Dominican Republic's resort-dotted northern coast on Monday, whipping up high waves and torrential downpours on a track that could see it reach the U.S. Southeast as a major storm by the end of the week.