Flies on Grant's
Are these flies Tsetse flies?
Another fly question, are the animals often affected by warble flies?
by davidbygott moderator
They are most likely little muscid flies like houseflies. They can be very numerous in wet season. Tsetse are only found in bush country and are bigger; this location looks like open plains.
I'm not sure about the warble flies, you would need to ask a wildlife vet.