Opportunistic feeders can be generalist species such as cockroaches and rats that will eat almost any type of plant or animal materials depending on their availability and nutritional needs.
Opportunistic feeders are important in natural ecosystems because they remove dead plant material and animal carcasses that would otherwise accumulate which would affect food chains and nutrients in the ecosystem.
The term Opportunistic feeders can also be used for people. These people eat what available rather than what is healthy or nutritious.