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Updated: May 18, 2025
As the caterpillar only uses these when disturbed, it is safe to presume that they are placed for defence, but as in the case of moths I doubt their efficacy. Some lepidopterists have thought the sex of a moth could be regulated by the amount of food given the caterpillar; but with my numerous other doubts I include this. It is all of a piece with any attempt at sex regulation.
Moths having digestive organs and that are feeders are susceptible to anaesthetics in a far higher degree than those that do not feed. Many scientific workers confess to having poured full strength chloroform directly on nonfeeders, mounted them as pinned specimens and later found them living; so that sensitive lepidopterists have abandoned its use for the cyanide or gasoline jar.
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