What is the reason why caterpillars have bristles?

The caterpillars with bristles use the bristles as a defense mechanism. The bristles often are poisonous, and can cause severe irritation to predators, and even humans. You should never touch a caterpillar with bristles (or bright color) without wearing hand protection like gloves. This is the woolly bear caterpillar. read more

The caterpillars with bristles use the bristles as a defense mechanism. The bristles often are poisonous, and can cause severe irritation to predators, and even humans. read more

The bristles, or setae, are a means of defense for many caterpillars. While the bristles on some species do not cause irritation, others have urticating hairs that cause irritation. There are two different types of urticating hairs. read more