 For example, Luskin et al (2017) found that native animals living in protected primary rainforest in Malaysia found food subsidies in neighboring oil palm plantations.This subsidy allowed native animal populations to increase, which then triggered powerful secondary ‘cascading’ effects on forest tree community.Specifically, crop-raiding wild boar ("Sus scrofa") built thousands of nests from the forest understory vegetation and this caused a 62% decline in forest tree sapling density over a 24-year study period.