The blue-crowned hanging parrot (Loriculus galgulus) is a parrot species endemic to southern Burma and Thailand, Malaya, Singapore, and Indonesia (Sumatra, Java, Borneo). These parrots are 12cm in height and weight 28g and have a longevity of 14 years. They are recognized by their green plumage, black beak and characteristic blue feathers arranged like a crown on their head.
Blue-crowned hanging parrots have green plumage and adults have black beaks. There is sexual dimorphism between males and females of the species. Adult males have a characteristic blue "crown" patch on their head and a red mark on their throat as well as a red rump bordered by a yellow lower back. Adult females plumage is duller green in color compared to the males, they do not have the red throat mark and have a less apparent or absent blue crown on the head and lack yellow feathers on their lower back. Juveniles' plumage is dull green, they also have little to no blue crown patch, they have a little to no blue crown visible and their bills are light in color.
The calls these birds make when flying are shrill and squeaky. When flying in flocks, the calls can be described as rapid and ringing. As they forage, they utter shrill two-syllable calls.
