Deer fly

Woodlands, wetlands, and areas near water sources, often found outdoors in sunny weather.

Adult females require a blood meal from mammals to develop eggs, while males feed primarily on nectar and plant juices.

Active during daylight hours, females are persistent biters that use visual cues and movement to find hosts. Larvae develop in wet soil or mud near water.

Risks include painful bites that can transmit certain pathogens and cause allergic reactions; benefits include serving as a food source for birds, spiders, and other predators.