Most opportunistic feeding takes place during periods other than in the bright light of day. If you’ve ever watched aquatic insects hatch, you’ll notice the adults always fly upstream. This is compensated for by the immature stages of the insects releasing themselves from their position and drifting downstream until they find a new home. This phenomenon occurs four times a day with major occurrences at first and last light; it’s called behavioral drift.
This is an excerpt form my upcoming book,I the meantime check out the ebook version