Pine processionary development, pine processionary caterpillars are highly irritating to the skin. Contact with the hairs of the caterpillar can cause severe rashes (urticaria) and eye irritation. Some individuals may have an allergic reaction to the caterpillar's hairs. 5th stage larvae can eject hairs when threatened or stressed; the hairs, which have the form of harpoons, then penetrate and irritate all areas of exposed skin nearby with an urticating protein. Allergic reactions may follow in susceptible individuals on subsequent exposure to the hairs. The pine processionary is an economic pest in coniferous forests in southern Europe. It is controlled to some extent
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.