Anorrhinus

Anorrhinus is a genus of hornbills in the family Bucerotidae, distributed across parts of South and Southeast Asia. The genus comprises several species that inhabit tropical and subtropical forests as well as woodland edges, often in hilly or foothill regions. Birds in this genus are typically medium-sized hornbills with relatively slender bills and casques that are prominent but not as large as those seen on some other hornbill species. Plumage tends to be subdued in tone, with variations across species and sexes.

Diet for Anorrhinus species is primarily frugivorous, with fruit making up the bulk of their intake; they also consume insects and small animals when available. Like other hornbills, they are cavity nesters. The female seals herself inside a nesting hole in a tree, aided by a wall of mud, resin, and plant material created with the male’s help, leaving only a narrow opening through which the male can feed the incubating bird and later the chicks. The male guards the nest and provides food until the young birds are ready to fledge.

Taxonomically, Anorrhinus is distinguished from other hornbill genera by a combination of morphological characteristics and molecular relationships identified in contemporary classifications. The genus has experienced revisions as new genetic data have refined hornbill relationships, leading to changes in how some species are grouped within Anorrhinus or related genera.

Conservation status varies among species in the genus. Loss of forest habitat, fragmentation, and hunting pressure threaten several populations, underscoring the importance of habitat protection and ongoing monitoring.