Heterotrophs is also a decomposer: the definition of scavengers is a problem. Many animals sometimes eat scavengers. Sometimes, they eat carnivorous and herbivorous things. It is largely determined by the environment. People eat dead animals when they are hungry. In addition, scavengers such as vultures sometimes attack animals before they die. Many standard carnivores also target disabled animals. The only difference between them is the frequency of prey categories. But some divisions are very strict. For example, many spiders, mantises and dragonflies never eat dead things (including not killing themselves). Many scavengers only lay eggs when their bodies rot. Their larvae are strict scavengers. Of course, scavengers are parasitic in life.