Roundworms constitute 4/5 of all individual animals on Earth, and they´re key players in the sustainability of oceans, lakes and forests worldwide. In the forests, roundworms have been studied in the soil, but no one has ever sampled the forests` canopy for them. Science knows virtually nothing about canopy roundworms` abundance, ecology and functional roles in the ecosystem. We´ll climb to the top of Brazil´s Atlantic Forest to reveal these and other aspects of canopy roundworms.