Monarch butterflies, those delicate symbols of spring and summer, should mostly be in Texas by now, winging their way to Mexico for the winter. The butterflies are late on their migration south, they should be in Texas at this time, because unusually warm weather delayed their flight. (Darlene Burgess via AP)Many of these butterflies might not even be alive if not for the warm weather. They are thought to be a sort of bonus generation — they were able to develop and emerge late in the season because it's been so unusually warm. Winds and other factors aren't making it easy or maybe even possible for the butterflies to go south before the coming frost.

Source: CBC News October 27, 2017 11:15 UTC