You can give thanks to Dennis Hlynsky for these beautiful images.
The next video is just genius. Basically, he wants to find out if the fruit flies crawl random or if they actually walk over all the surface of the fruit. This is the result.
He tries similar experiments with ants… but the result is not that impresive. Basically the area is very small and there is nothing interesting in there to see ants start forming patterns (like when going for food).