What feeding behavior defines a secondary feeder among these insects?

A secondary feeder is characterized by its feeding behavior of consuming food sources that have already been compromised or damaged. This typically means they do not directly damage food products themselves but rather exploit those that are already in a state of decay or have been affected by other organisms, such as fungi or primary feeders.

This feeding strategy allows secondary feeders to thrive in environments where competition for food is high, as they can utilize resources that other organisms may have left behind. Their role is crucial in the ecosystem as they help in the breakdown and recycling of organic matter, but they do not instigate damage, which distinguishes them from primary feeders.

In the context of the other options, the primary feeders are those that actively hunt or prey upon other insects (which describes predators), and those that feed on decaying organic matter are known as decomposers—both of which serve different ecological roles. Additionally, the option stating that they are not harmful to stored products is too broad and does not specifically define secondary feeders as their primary role involves scavenging rather than actively causing harm. Hence, the clarity on consuming already damaged food sources is what correctly identifies the feeding behavior of secondary feeders.