What is a key feature of heavy infestations of parasites such as bedbugs?

A key feature of heavy infestations of parasites like bedbugs is the presence of odorous excrement. Bedbugs excrete a waste product that can have a distinctive and unpleasant odor, often described as sweet or musty. This smell can become particularly noticeable in cases of significant infestation, adding to the difficulty of managing and identifying the problem.

In contrast, while visible larvae may be associated with certain pest infestations, bedbugs do not have a larval stage; they go through egg, nymph, and adult stages. Increased activity may be observed, but it is not as definitive a characteristic of an overwhelming infestation as the smell produced by their droppings. As for vivid color patterns, bedbugs are generally brownish in color and do not exhibit vivid coloration that would be associated with identification of heavy infestations. Therefore, the presence of odorous excrement stands out as a clear indicator of significant bedbug infestations.