Robber Flies are an incredibly large family of insects with over 7,000 species having been identified. They are found all over the world except for Antarctica. The main concentration of them is found in more tropical habitats.
Robber Flies are also known as Assassin Flies. They tend to perch on a pieces of grass or leaf and wait for suitable prey to fly past. They stab their prey with their short proboscis and inject them with a fluid that paralyses the victim. They will attack virtually any other insect including grasshoppers, butterflies, bees, beetles and dragonflies.
They are most often found in open areas which gives them plenty of space to look for prey.
First Field Guide to Insects of Southern Africa - Author: Alan Weaving - Year Published: - Page: 45
Suburban Wildlife in KZN - Author: Jason Londt - Year Published: 2009 - Page: 64
Suburban Wildlife in KZN - Author: Jason Londt - Year Published: 2009 - Page: 72