ROME, ITALY—Excavation of the ancient sewer system at the Colosseum with robots has discovered the pits of figs, grapes, cherries, blackberries, and nut shells, according to a BBC News report. Alfonsina Russo of the Colosseum Archaeological Park said that the foodstuffs may have been eaten while Roman spectators watched gladiator battles some 2,000 years ago. The bones of bears and big cats, which may have been used during hunting games in which the animals were forced to fight each other and the gladiators, were also found, along with the bones of dogs. Finally, some 50 bronze coins dated from about A.D. 250 to 450, and a second-century A.D. silver coin commemorating 10 years of the reign of the emperor Marcus Aurelius, were also recovered. To read about equipment gladiators used to fight in the Roman arena, go to "Weapons of the Ancient World: Gladiator Weapons."