A comparison of the (false-colored) eyes of the robber fly (left), the ... acuity in the fly's visual field. The fly's peripheral vision, on the other hand, is not as impressive.

You might expect that the miniature brains and eyes of tiny robber flies would limit ... "We knew that these flies likely had an improved vision compared to other true flies, but we never imagined ...

The robber fly Holcocephala is a relatively small fly ... more than half a metre away in less than half a second -- by comparison to its size, this would be the equivalent of a human spotting ...