The Brown-eared Bulbul (Hypsipetes amaurotis) is a striking and vocal bird species that is widely recognized across East Asia. Known locally as “hiyodori” in Japan, this medium-sized bulbul is familiar to many due to its adaptability to both natural and urban environments. The Brown-eared Bulbul is notable for its distinctive brown ear patches, a feature that gives the species its common name, and its varied, often loud calls that fill the air in many parts of its range. This bird plays an important ecological role in seed dispersal and insect population control, making it a fascinating subject for bird enthusiasts and researchers alike.
Scientific Classification
The Brown-eared Bulbul belongs to the family Pycnonotidae, commonly known as the bulbul family, which comprises about 150 species of medium-sized passerine songbirds. The scientific name of the Brown-eared Bulbul is Hypsipetes amaurotis, though it was formerly classified as Microscelis amaurotis. This reclassification reflects improved understanding of its phylogenetic relationships within the bulbul family. The genus Hypsipetes includes several other species found across Asia, all characterized by their melodious calls and generally robust bodies.
Bulbuls are generally placed within the order Passeriformes, known as perching birds or songbirds. Within Pycnonotidae, the Brown-eared Bulbul is closely related to species such as the Black Bulbul (Hypsipetes leucocephalus) and the Streak-eared Bulbul (Pycnonotus conradi), sharing many behavioral and ecological traits. Its taxonomic history has involved some debate due to morphological variations across its range, but current genetic studies support its classification within Hypsipetes.
Geographic Range & Distribution
The Brown-eared Bulbul has a broad geographic distribution across East Asia. Its range extends from the Russian Far East, including the island of Sakhalin, south through northeastern China, the Korean Peninsula, and Japan, continuing down to Taiwan. It also inhabits the northern island chains of the Philippines, specifically the Babuyan and Batanes groups, with occasional sightings on the larger island of Luzon.
In Japan, the species is widespread and common, inhabiting a variety of habitats from dense forests to urban parks and gardens. It is one of the most familiar bird species in Japanese cities, where it thrives alongside human development. In Taiwan, however, the Brown-eared Bulbul is much rarer and primarily found on Orchid Island off the southeastern coast. Populations in mainland China and the Korean Peninsula tend to be stable but less well-studied.
These bulbuls are partially migratory. During the colder months, populations in the northernmost parts of their range, such as the Russian Far East and northern Japan, migrate southwards to avoid harsh winter conditions. Migration routes often involve forming large flocks that travel to southern Japan, Taiwan, and the Philippines. Interestingly, recent changes in agricultural practices and urbanization have allowed some individuals to overwinter farther north than in the past, taking advantage of warmer microclimates and food availability.
Physical Description
The Brown-eared Bulbul is a medium-sized bird, measuring approximately 25 to 28 centimeters (10 to 11 inches) in length, including its relatively long tail. It weighs between 50 and 70 grams (1.8 to 2.5 ounces), making it a robust member of the bulbul family. The wingspan typically ranges from 34 to 38 centimeters (13 to 15 inches).
Its plumage is predominantly greyish-brown, offering effective camouflage in wooded environments. The most distinctive feature is the patch of brown feathers surrounding the ears, which contrasts with the generally duller tones of the rest of the body. The head and upperparts are a muted grey-brown, while the underparts are paler with a slight buff hue. The bird’s eyes are dark and alert, often outlined by a subtle white ring that adds to its expressive facial features.
The Brown-eared Bulbul’s bill is moderately long and slightly curved, adapted for a diet that includes both insects and fruit. Its legs and feet are dark grey or black, providing strong grip for perching and maneuvering through dense foliage. Juvenile birds tend to have duller plumage but quickly acquire the adult coloration within their first year.
Behavior & Diet
The Brown-eared Bulbul is a highly vocal and active bird, known for its loud, squeaky calls that are a hallmark of many East Asian forests and urban areas. These calls serve multiple purposes, including communication between mates, territorial defense, and signaling alarm. The species is generally social, often seen in small groups or family units outside the breeding season, and larger flocks during migration.
Ecologically, the Brown-eared Bulbul is an omnivore with a diet that shifts seasonally. In spring and summer, it primarily feeds on insects and other small invertebrates, which provide essential protein for growth and reproduction. Common prey items include beetles, caterpillars, and various larvae found in foliage. During autumn and winter, when insects are less abundant, the bulbul shifts to a diet rich in fruits, berries, and seeds. It favors a wide variety of fruiting plants, including mulberries, cherries, and citrus species, playing a crucial role in seed dispersal for many native plants.
The bird is adaptable in its foraging behavior, feeding both in trees and shrubs, and occasionally on the ground. It has been observed visiting bird feeders in urban areas, where it readily consumes commercial fruit and nectar products. This dietary flexibility has helped the Brown-eared Bulbul thrive in diverse environments, from dense forests to city parks and gardens.
Breeding & Reproduction
The breeding season of the Brown-eared Bulbul generally occurs from April to July, coinciding with the warmer months when food resources are abundant. During this period, males become more vocal and territorial, engaging in elaborate songs and displays to attract mates and establish nesting territories. According to Cornell Lab of Ornithology, this species is well documented.
The species builds neat, cup-shaped nests typically located in the forks of trees or dense shrubs, often between 1 to 5 meters above the ground. The nests are constructed from twigs, grasses, moss, and lined with softer materials such as feathers and plant fibers to provide insulation and comfort for the eggs and chicks. According to RSPB, this species is well documented.
Clutch size usually ranges from two to four eggs, which are pale with speckled markings. Both parents share incubation duties, which last approximately 12 to 14 days. After hatching, the chicks are altricial—born blind and helpless—and depend entirely on their parents for feeding. The nestlings fledge in about two weeks but often remain near the nest for several days as they develop flight skills and independence.
Brown-eared Bulbuls are known to raise more than one brood per season in favorable conditions, reflecting their adaptability and reproductive strategy to maximize survival. Parental care extends well beyond fledging, with adults continuing to feed and protect juveniles until they are fully independent.
Conservation Status
According to the International Union for Conservation of Nature (IUCN), the Brown-eared Bulbul is currently classified as a species of Least Concern. This status reflects its wide distribution, relatively large population size, and adaptability to varied habitats, including urban landscapes. There are no major widespread threats causing significant population declines at present.
However, local populations can be affected by habitat destruction, particularly deforestation and land-use changes in parts of China and Taiwan. Urban expansion has had mixed effects—while it has reduced natural forested areas, it has also created new niches in parks and gardens where the species can thrive. Additionally, pesticide use in agricultural areas can reduce insect availability, impacting food resources during the breeding season.
Ongoing monitoring is important to ensure that population trends remain stable, particularly considering potential future threats from climate change, which could alter migration patterns and habitat suitability. Conservation efforts that protect native forests and promote biodiversity-friendly urban planning benefit the Brown-eared Bulbul and many other bird species.
Interesting Facts
The Brown-eared Bulbul is often considered a symbol of the changing seasons in Japan, where its calls mark the arrival of spring and the approach of autumn. Its loud, distinctive vocalizations have made it a popular subject in Japanese poetry and folklore. The name “hiyodori” itself is an onomatopoeic reference to the bird’s call.
Unlike many bulbuls, which are primarily forest dwellers, the Brown-eared Bulbul has shown remarkable adaptability to human-altered environments. It is frequently spotted in urban gardens, agricultural fields, and even shopping districts, where it scavenges for food scraps and visits fruit-bearing trees.
During migration, these bulbuls can form large flocks, sometimes numbering in the hundreds or thousands. Such gatherings provide safety in numbers and enhance foraging efficiency. Observers often note the synchronized movements and chattering of these flocks as a spectacular avian phenomenon.
This species also exhibits an interesting behavior called “anting,” where it allows ants to crawl on its feathers. This is believed to help remove parasites or soothe irritated skin, demonstrating a sophisticated form of self-care rarely documented in many bird species.
Conclusion
The Brown-eared Bulbul (Hypsipetes amaurotis) is a captivating bird species that embodies the resilience and adaptability of wildlife in East Asia. From its distinctive brown ear patches to its loud and varied calls, this bulbul is a familiar and cherished presence in forests, cities, and rural landscapes. Its broad diet, flexible behavior, and reproductive strategies have allowed it to flourish across a wide range of environments, making it an important ecological player in both natural and human-dominated ecosystems.
For birdwatchers, photographers, and nature enthusiasts, the Brown-eared Bulbul offers a rewarding glimpse into avian life adapted for survival in a changing world. Continued observation and conservation efforts will ensure that this vibrant species remains a lively part of East Asia’s rich biodiversity for generations to come.
