Especially in captivity in National Zoo of Malaysia, Singapore Zoo and Dusit Zoo, milky storks and painted interbred to produce hybrid offspring. These hybrids apparently vary in appearance through different combinations of milky stork and painted stork phenotypes in varying proportions. Because these hybrid juveniles are not readily distinguishable from pure-bred juveniles based on morphology, molecular methods have been used to detect possible hybrids. Compared to the parent painted stork, the adult hybrid has a pink rather than orange bill and head. Adult hybrids may also have some small black spots on the white wing and a subtle pink tinge on the feathers.