Die Witborskormorant of Witborsduiker (Phalacrocorax lucidus) is ‘n watervoël, hoofsaaklik kuslewend, wat aan die hele Suid-Afrikaanse kus voorkom, asook binnelands, hoofsaaklik op damme en mere. In Engels staan die voël bekend as die White-breasted Cormorant. Hierdie kormorant het ‘n donkerbruin rugkant en stert, wit keel en bors terwyl alle vlerkvere swart rande het. Die onvolwassenes is ‘n effens ligter bruin van kleur sonder enige wit op die bors. Hulle kom veral voor by riviermondings, strandmere, eilande en binnelandse waters. Die voëls kan enkellopend wees of in swerms voorkom. Hulle sit graag op takke of stompe met die vlerke uitgestrek om uit te droog. Hulle vreet hoofsaaklik vis en maak nes in kolonies op rotslyste, in bome of op die grond.
The white-breasted cormorant (Phalacrocorax lucidus) is much like the widespread great cormorant and if not a regional variant of the same species, is at least very closely related. It is distinguished from other forms of the great cormorant by its white breast and by the fact that subpopulations are freshwater birds. Phalacrocorax lucidus is not to be confused with the smaller and very different endemic South Australian black-faced cormorant, which also is sometimes called the white-breasted cormorant.
The white-breasted cormorant (Phalacrocorax lucidus) is a member of the cormorant family Phalacrocoracidae. Its taxonomic status has been under discussion for some decades and several questions still have not been definitively settled. Phalacrocorax lucidus sometimes is treated as a subspecies of the great cormorant, Phalacrocorax carbo lucidus, but some authorities (e.g. Sibley & Monroe, 1990, Sinclair, Hockey and Tarboton, 2002) retain its original treatment as an allospecies in the P. carbo superspecific group, in which case it is referred to as Phalacrocorax lucidus. A black-necked form originally classified as Phalacrocorax patricki or Phalacrocorax carbo patricki is now regarded as synonymous with Phalacrocorax lucidus.
As its name suggests, the 80–100 cm long white-breasted cormorant has a white neck and breast when adult, and the white area tends to increase as the bird becomes more mature. In other respects it is a large cormorant generally resembling the great cormorant.
The smaller and very different southern Australian black-faced cormorant, Phalacrocorax fuscescens, is also sometimes known as the white-breasted cormorant.