What do processionary caterpillars look like at different stages of their life cycle?

Processionary caterpillars are fascinating creatures that undergo several distinct stages in their life cycle, each with unique characteristics. Initially, the eggs are laid by adult moths, appearing as small, white clusters or masses that can often be found on the branches of host trees. Once the eggs hatch, the young caterpillars emerge in late winter or early spring. At this stage, they are quite small, typically measuring just a few millimeters long, and are covered in fine hair that gives them a somewhat fuzzy appearance. Their coloration tends to be a mix of black and yellowish stripes, which helps with their camouflage among the leaves and twigs.

As they grow, these caterpillars enter the larval stage, where they can reach significant lengths of around 5 to 7 centimeters. This is when their most recognizable features come into play; they develop a more pronounced hairy exterior, which serves as a defense mechanism against predators. Their bodies become adorned with long, fine hairs, often presenting a striking pattern of black, yellow, and orange. During this phase, they are known for their unique behavior of moving in a line, often referred to as a "procession," which not only aids in protection but also helps them stay connected as they travel in search of food.

The final stage of their life cycle is the pupal stage, where they spin silk cocoons for protection. At this point, the caterpillars become less visible as they transition into moths. The pupae are often found hidden in leaf litter or within the silk structures they create. Once they emerge as adult moths, they are typically less colorful than their caterpillar stage, showcasing muted hues that blend into their surroundings. This life cycle is not only an incredible demonstration of nature's transformation but also a reminder of the delicate balance within ecosystems, making them an intriguing subject for nature enthusiasts and travelers alike.