This species is said to be more closely associated with water than other thick-knees and also more active during the day. Its streaked gray wing panel distinguishes it from the more widespread Spotted Thick-knee (B. capensis). Thick-knees are in their own family, the Burhinidae. They are rather large, mostly nocturnal plover-like birds which rely on their cryptic coloration for concealment. Their large eyes are well adapted for foraging at night. Some authors call this bird the Water Dikkop. Digiscoped with Panasonic DMC-LX5 | Nikon FieldScope III | 30XWA | hand-held (no adapter).
References:
Hockey, PAR, WRJ Dean, and PG Ryan, eds. 2005. Roberts' Birds of Southern Africa. 7th ed. Cape Town: John Voelcker Bird Book Fund.
Hume, R. & Kirwan, G.M. (2018). Water Thick-knee (Burhinus vermiculatus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/53768 on 6 July 2018).
Sinclair, I., Hockey, P.A.R., Arlott, N. (2005). The Larger Illustrated Guide to Birds of Southern Africa. Struik, Cape Town