description Isabella tiger moth Overview
The Isabella tiger moth, *Pyrrharctia isabella*, is a North American moth belonging to the erebid family. Notably, it exhibits striking orange and white coloration resembling the woolly bear caterpillar. This appearance has long fueled folklore regarding winter forecasts, though scientific evidence does not support this association. The moth is common across Canada and the United States and provides food for various insectivores.
insights Ranking position
Isabella tiger moth ranks #57 of 561 in the Moth ranking, behind Giant peacock moth, ahead of Giant leopard moth.
help Isabella tiger moth FAQ
Does an Isabella tiger moth start life as a woolly bear caterpillar?
Yes, the banded woolly bear is the larval form of Pyrrharctia isabella. After overwintering as a caterpillar, it feeds again, pupates in a cocoon, and emerges as a yellow-orange adult moth.
Can a woolly bear's black and brown bands predict winter weather?
No scientific forecast can be made from the bands, despite North American folklore linking more black hairs with a harsher winter. Band proportions can vary with the caterpillar's age, growth, and environmental conditions.
How does the woolly bear survive freezing weather?
The caterpillar shelters in leaf litter and produces cryoprotective chemicals that function like biological antifreeze. This lets the Isabella tiger moth overwinter in its larval stage rather than as an adult.
What does the adult Isabella tiger moth look like?
The adult is yellow-orange to pale tan with small black spots, not black and rust-banded like its caterpillar. Its wingspan is roughly 1.75 to 2.25 inches.
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