Zero-deforestation commitments within the palm oil industry risk being undermined by a lack of monitoring within production landscapes—meaning the deforestation of tropical forests home to Critically Endangered wildlife such as Sumatran tigers (Panthera tigris sumatrae) and orangutans (Pongo abelii) could be going unreported. This is just one finding of an in-depth evaluation of palm oil companies, published today by ZSL (Zoological Society of London).