To reach the shrine, pilgrims must cross part of the Doñana park, which is a protected area full of rare wildlife, including the famous lynx wild boar, horses, and many water birds on the marisma (wetlands) such as flamingos, herons, storks and egrets. Law enforcement is well organised, with Guardia Civil and others working hard not only to keep order, but also to protect the environment. Fire is a special concern, as this event is one long party involving copious amounts of drinking and smoking. Information campaigns combine with round-the-clock surveillance in order to keep both participants and Doñana safe every year. Volunteers follow the rocieros to collect the thousands of kilos of rubbish left behind.