There are approximately 30 species of Hanging Fly found in South Africa. Most of the Hanging Flies found in South Africa belong to the genus Bittacus.
These insects are predators and spend much of their time hanging by their front legs with their rear legs dangling in the air to catch an unsuspecting insect that flies by.
Hanging Flies tend to be active during the day but may sometimes be found inside houses at night. It appears that they may be disturbed by rain or wind at night and fly inside because of the lights.
Once a hanging fly catches another insect it injects it with some of its saliva which dissolves the unfortunate creatures insides. They then suck up this soup-like fluid.
References and further readingSuburban Wildlife in KZN - Author: Dr. Jason Londt - Published: 2009 - Page: 54
The Sandton Field Guide - Author: Sandton Nature Conservation Society - Published: 1982 - Page: 142
Struik Pocket Guides for Southern Africa - Insects - Author: Erik Holm and Elbie de Meillon - Published: 1988 - Page: 50
Insectopedia - Author: Erik Holm - Published: 2017 - Page: 162
Insects of Southern Africa - 1st edition - Author: Clarke H. Scholtz and Erik Holm - Published: 1989 - Page: 281
Pocket Guide - Insects of South Africa - Author: Mike Picker & Charles Griffiths - Published: 2015 - Page: 88
Field Guide to Insects of the Kruger National Park - Author: Leo Braack - Published: 1991 - Page: 108
Field Guide to Insects of South Africa - Author: Mike Picker, Charles Griffiths and Alan Weaving - Published: 0 - Page: 262
African Insect Life - revised edition - Author: S.H. Skaife - Published: 1979 - Page: 136
A Beginners Guide to the Insects - Author: Jason G.H. Londt - Published: 1984 - Page: 71