The role of a scavenger in an ecosystem is to consume the remains of dead organisms, contributing to nutrient cycling and energy flow. By breaking down organic matter, scavengers help in the decomposition process, which enriches the soil and fosters biodiversity. Common scavengers include species like vultures, hyenas, and certain insects, which play a critical part in maintaining the health and balance of ecosystems. Their activity prevents the spread of disease by removing decaying matter.