 When old enough, orangutans are released into the protected Lamandau Wildlife Reserve.Orangutan Foundation works to protect orangutans by focusing on habitat protection and capacity building, especially in local communities.A seven-year longitudinal study published in 2011 looked at whether the lifespan of zoo-housed orangutans was related to a subjective assessment of well-being, with the intent of applying such measures to assess the welfare of orangutans in captivity.