What are sandflies known for?

Sandflies are primarily known for being small, bloodsucking gnats. These tiny insects belong to the family Psychodidae and are notorious for their bites, which can be quite painful and cause allergic reactions in some individuals. Sandflies typically feed on the blood of animals and humans, and they are vectors for several diseases such as leishmaniasis and sandfly fever, which further emphasizes their significance in terms of public health.

The other options do not accurately describe sandflies. They are not harmless insects; in fact, their bites can be harmful and lead to disease transmission. While some insects are used in pest control, sandflies do not play this role in an ecological or agricultural context. Additionally, while many insects are attracted to sugary substances, sandflies are primarily focused on blood meals for their reproductive cycle, making this option less relevant to their identity.