Horse flies are large and greyish or black. They have enormous green or purple eyes, and they’re about ⅜” to 1 ⅛” long with 6 legs and a pair of wings.
House flies are usually greyish or black, with very large compound eyes and 6 legs. Their large eyes allow them to see with much wider vision than humans can They’re ⅛” to ¼” long, and their bodies are covered in tiny hairs.
Fruit flies are tiny flies whose bodies are about ⅛” long. They get their name from their strong affinity for ripe fruit and juices.