Local ecological knowledge reveals an undocumented population of Reeves’ butterfly lizard (Leiolepis reevesii) in Zhuhai, China

Though widespread and categorized as least concern by the IUCN Red List, Reeves’s butterfly lizard (Leiolepis reevesii) is considered critically endangered in China. Up-to-date data are warranted to inform future assessments and conservation measures. Through local ecological knowledge surveys and corroborated by field surveys, we discovered an undocumented L. reevesii population on Qi’ao Island of Zhuhai City, Guangdong Province, China. This discovery is the first record of the species in the Pearl River Delta since the early 2010s and represents the only remaining population from the vicinity of its type locality. It was reported to be very rare on the island now and has been extirpated from most of its previous range due to overharvesting, habitat loss and degradation. Our findings also raised concerns about the erosion of local ecological knowledge among local communities. Urgent conservation action and education campaigns are required to prevent further declines and raise awareness of this important and threatened population.