Why are people reporting so many Monarch (and other species) of butterflies later in the year than normally reported? There are several simple reasons.
- More people are noticing butterflies, especially Monarch butterflies. The internet has increased the number of people who recognize Monarch butterflies. More people (than in the past) are aware of the dates they should normally be absent in an area. They record and share the dates that they spot Monarch butterflies in their area. In the past, when people would see the exact same species on the exact same place and on the exact same date they didn’t report it. It meant nothing to them.
- More people are raising caterpillars indoors. This protects them from nature’s enemies, including cold temperatures. Many of the butterflies spotted were raised indoors. If they had been left outdoors, low temperatures would have killed them. There are more late-season butterflies because people save them from the weather.
- Artificial lighting (along with artificially raised temperatures) in communities and around houses often give a false sense of the time of year to caterpillars under the lights. This can prevent some from going into diapause and/or migrating.
Late season butterflies aren’t a reason to panic. Nature will take care of them. If they are where it will freeze, they will die unless they are a species that survives freezing temperatures, such as Mourning Cloak butterflies.
Extra reports of late-season butterflies are a sign of good things: that people are noticing them and reporting them. When more people are aware of butterflies and their natural lives/life-cycles/timing, they are less apt to use insecticides in their gardens. They are more apt to plant butterfly host and nectar plants.