Definition - What does Scavenger mean?
A scavenger may be a living organism that consumes dead organic matter, a person who collects discarded items or a chemical that is used to consume or render impurities inactive.
Safeopedia explains Scavenger
Since scavengers of any kind do away with waste, they are extremely important to ecosystems, valuable in societies and useful in chemistry. In ecosystems, scavenging animals, birds, insects and micro-organisms are the final level in any food chain and restore nutrients to ecosystems while keeping them healthy by doing away with dead material.