Mueller's white-eye is a small bird that is endemic to the island of Hainan, China. Synonyms for this bird include Hainan white-eye, black-crowned white-eye, and Black-crowned White-eye. The bird is known for its distinctive black crown and white eye-ring, which make it easy to identify. It is a social species, often seen in flocks, and feeds on nectar, insects, and fruit. Due to habitat loss and degradation, Mueller's white-eye is classified as Near Threatened by the International Union for Conservation of Nature. Conservation efforts are underway to protect this species and its habitat.