Giant
Caterpillar Scares Children But Can't Hurt a Fly.- The largest
moth species in Pennsylvania, or at least the one with heaviest
body weight, is the regal moth, Citheronia regalis. It's
larvae is truly huge, the size of a large cigar, with orange and
blue coloration. It has large spiny horns just behind the head,
and when touched will rear up and bristle these in the face of an
intruder or curious child. It's all a bluff, as the horns are soft
and about the only thing this huge caterpillar might do is give
you a nip with its powerful teeth. The species has been slowly
becoming much less common, in part due to the distraction of female
moths by electric lights outdoors, and in part due to being
heavily parasitized by a fly that was intentionally introduced
as a pest control agent many years ago.
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