The monarch butterfly migration has been in full swing for a few weeks now. It will continue on until about the end of October, or the first freeze, whichever comes first. I was interested in the migration cycle of the butterfly as I knew that most butterflies only live a few weeks at the most in the adult stage. What I found was incredible.
Monarchs winter in either central Mexico or, for those west of the Rockies, in southern California. Those butterflies start northward in the spring, and while on the way lay eggs and die. The eggs hatch and form butterflies in three stages (caterpillar, pupae, and adult) in about a month. Those butterflies continue on their northward migration.
Those adults live just a few weeks (six to eight), mate, lay eggs, and die. That cycle repeats itself at least three times during the summer months. The fourth generation of monarchs is somewhat different from the other three in that the adults of that generation have the ability to live as adults for six to seven months.
They do that because they are the ones that begin the migration south, winter over, and start back north. They lay eggs and die sometime after they start back northward and the generations and the cycle continues.
It is not known how the butterflies that are born in the north know where to migrate to, when to leave, or how the fourth generation knows it is different than the others and will live for several months rather than just a few weeks. It is known that the butterflies can possibly utilize the earth’s magnetic field, although they cannot tell the north magnetic pole from the south. It is also thought that they can utilize ultraviolet light in some way.
I don’t know about you, but this is another one of those “gee whiz” scientific truths that just boggle the mind. Oh, we mostly just shrug off these things, but I think they are in our universe for a reason. You may disagree with me, but it seems that Someone is trying to tell us mortal humans something. I wonder if we are listening?
1 comment:
We are often in the migration path. It is an awesome site. And it is has always been on a weekend. We start seeing them come in on a Saturday evening. Nest in the trees overnight - and Sunday morning trees in the windbreak (right outside the dining room window where we can watch) are full of waking Monarchs. We truly enjoy this and marvel at God's creation and plan. - Kathy
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