Super-croc. (Earth News).

Paleontologist (fossil hunter) Paul Sereno had never seen anything like it: a 1.8 meter (6 foot)-long jawbone with 100 bone-crushing teeth and a toilet-bowl-size snout. Sereno discovered the 110-million-year-old fossil (an organism's preserved remains) half-buried in the scorching sand of Niger's Tenere Desert in Africa. Last October his team announced the monster remains belonged not to a killer dino but to a dino killer.

The jaw's owner: a 12 m (40 ft)-long crocodile cousin called Sarcosuchus imperator. Armed with a 10-ton body, this scaly beast was built for battle. Sereno believes it was strong enough to slaughter even a school bus-size dinosaur. "It lived an ambush lifestyle," he says. Its eye sockets were tilted skyward--more so than those of modern crocs--to scope a river's edge while it concealed 95 percent of its massive frame underwater. "The snout and teeth were designed for grabbing far meatier prey than fish."

The skeleton's giant overbite suggests this croc could lock onto large prey with 8,182 kg (18,000 lbs) of force! And the bulbous snout? It probably aided its acute sense of smell--or perhaps trumpeted a battle cry loud enough to send dinos whimpering home.