Quote:
Originally Posted by stevej37
Don't they migrate when the temps get that low?
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The Ruby Throats that come to Michigan and Ohio get the impulse to migrate based on the sun. No one knows if it is the height of the sun or the hours of daylight. They start to take off sometime in late August and are all gone by mid-October. They double their body weight to around 6 grams getting ready for the trip to Central America, so keep the feeders out for a couple of weeks after you see the last one.