Three tooth marks on the rib indicate the whale was once severely bitten by a strong-jawed animal. Judging by the 6-centimeter (2.4 inch) spacing between tooth marks, scientists believe the attacker was a mega-toothed shark Carcharocles megalodon, or perhaps another species of large shark that was alive at that time. It’s not clear if the whale managed to escape or not. Finding fossils that capture moments of interaction between predators and prey is exceptionally rare. Yet, this is precisely what paleontologists have discovered in the rib fragment: three distinct tooth marks that suggest a po…