Pine processionary maximum recorded of . The species flies from May to July. "T. pityocampa" is a highly social organism. Throughout its life cycle, a pine processionary will make several shelters. The first of these are flimsy and temporary, but in the third instar, they build a permanent nest. Once their permanent nest is built, the caterpillars become foragers staying in the vicinity of the nest. The nest has no openings, so caterpillars force themselves through the layers of the shelter. The waste from the larvae's diet accumulates at the bottom of the nest. The pine processionary caterpillar is responsible for most
Animal welfare and rights in the Netherlands is unclear what the implications of this declaration are in practice. As a member of the European Union (EU), beginning in the 1990s Netherlands began to implement EU regulations on animal welfare, including a 1997 measure forbidding pen confinement of veal calves greater than 8 weeks old, a 1998 directive on the five freedoms for farmed animals, and bans on testing cosmetics on animals, barren battery cages, and gestation crates. The Animals Act 2011 prohibits causing an animal pain or injury or damaging its health and welfare without reasonable purpose or in excess of what is reasonable for such purpose.