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The adult moth is covered in long fur in colors ranging from dull orange to lemon yellow, with hairy legs and fuzzy black feet. [ citation needed ] The cocoons that these caterpillars emerge from vary in size from 1.3 to 2.0 centimeters and contain small hair pockets on the back and flattened front end, the latter covering the operculum at ...
As caterpillars, they tend to feed on a wide range of host plants. This includes oak, apple, birch, willow, hackberry, cherry and coniferous trees such as fir and spruce.
Costa Rican hairy caterpillar. The spiny bristles are a self-defense mechanism The spiny bristles are a self-defense mechanism The appearance of a caterpillar can often repel a predator: its markings and certain body parts can make it seem poisonous, or bigger in size and thus threatening, or non-edible.
Canadian and U.S. folklore holds that the relative amounts of brown and black hair on a larva indicate the severity of the coming winter. It is believed that if a Pyrrharctia isabella 's brown band is wide, winter weather will be mild, and if the brown band is narrow, the winter will be severe.
The female is slightly larger than the male in larva form, and as an adult finds a mate by extruding an organ that emits a pheromone which the male can smell. The male, which unlike the female has the large, feathered antennae characteristic of pheromone-using moths, flies zigzag search patterns, eventually homing in on a female.
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After about a month, full-grown caterpillars crawl to the bottom of the host tree and pupate in shallow underground chambers. The pupae are very dark, elongated, and have small spines. The pupa ends in a small forked point. [12] The pupal stage lasts at least two weeks and up to the whole winter.
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