Abstract
IT is well known that locusts migrate, but few realise that similar movements take place in other insects, and particularly in the dragonflies and the butterflies and moths. The evidence for such movements is chiefly of two kinds. First, it is found that some insects exist over large areas only for a short time, and after a period of absence may appear again suddenly in large numbers. Secondly, observers, particularly but by no means entirely in the tropics, have often seen hundreds of thousands of butterflies moving steadily in one direction, sometimes passing for hours on end and sometimes even for days or weeks.
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Migration in Butterflies and Moths*. Nature 126, 630–631 (1930). https://doi.org/10.1038/126630a0
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DOI: https://doi.org/10.1038/126630a0