The hot and dry weather in the Netherlands last week were the ideal conditions for oak processionary butterflies to start crawling out of their pupa. The butterflies are expected to lay many eggs on oak trees across the country, which may result in more problems with the poisonous caterpillars again next year, AD reports.
"The oak processionary butterfly lives only a few days. They look for a male or female to mate with. The female lays her eggs in the tree, and that's it", Henry Kuppen of the Knowledge Center on the Oak Processionary Caterpillar said to the newspaper.