scavenger

• someone who collects things that have been discarded by others
• a chemical agent that is added to a chemical mixture to counteract the effects of impurities
• any animal that feeds on refuse and other decaying organic matter
• A person whose employment is to clean the streets of a city, by scraping or sweeping, and carrying off the filth. The name is also applied to any animal which devours refuse, carrion, or anything injurious to health

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