In the past, with humans absent, more intense competition for food between carnivores probably led to a need to eat kills quickly and completely, resulting in more broken fangs.

• 而在远古时期人类缺席的情况下，食肉动物之间对食物的竞争非常激烈，这要求必须尽快将杀死的猎物吃光，于是更多的断牙出现了。