Predation can be seen everywhere today, but it is much more difficult to detect for ancient ecosystems. The majority of attacks are recorded by trace fossils, a separate category of fossils showing animal behavior. These trace fossils are usually preserved within the remains of the prey. Common examples are bite marks on bones, drill holes in mollusk shells, and repair scars in mollusks. Ammonites, very common but now extinct cephalopod mollusks distantly related to modern-day Nautilus, were ...
