What blood-feeding insects are observed to increase in size significantly?

Ticks are known for their ability to significantly increase in size after feeding on blood. This characteristic sets them apart from many other insects. When a tick attaches to a host, it begins to consume blood, which causes its body to expand considerably. The process can result in a tick's size increasing dramatically from a tiny, often barely noticeable creature to one that is engorged and easily identifiable.

This feeding habit is crucial for ticks as it is part of their reproductive cycle. A female tick, for instance, must consume a large volume of blood to produce eggs. This feeding and size increase not only allow them to grow but also play a vital role in their survival and lifecycle.

In contrast, other insects like beetles, mites, and wasps do not exhibit such a dramatic size increase when feeding. While some might experience minor swelling or growth, it is not to the extent observed in ticks. Thus, ticks stand out as the blood-feeding insects that are specifically recognized for their significant increase in size after feeding.