Milky stork – Maleise nimmerzat – Mycteria cinerea

FESCH.TV INFORMIERT:

The milky stork (Mycteria cinerea) is a stork species found predominantly in coastal mangroves around parts of Southeast Asia. It is native to parts of Cambodia, Vietnam, Malaysia and Indonesia. They were once part of the genus Ibis, but is currently included in the genus Mycteria, due to similarities with other storks in that genus.
Milky Storks are around 91-97 cm tall, with a wingspan of 43.5-50 cm and a tail around 14.5-17 cm. Their plumage is white, apart from a few feathers at the wings and tail.
Since the 1980’s, Milky stork populations have decreased exponentially, from 5,000 to only 2,000 due to habitat destruction of their mangroves, overfishing of their food source, and the illegal smuggling of their chicks. The IUCN classifies it as endangered on the IUCN red list.
This medium stork stands 91–97 cm tall, making it slightly smaller than the closely related painted stork. The adult plumage is completely white except for black flight feathers of the wing and tail, which also have a greenish gloss. Wing length measures 435–500 mm and the tail measures 145–170 mm. The extensive white portion of the plumage is completely suffused with a pale creamy yellow during the breeding season, hence the term “milky”. This creamy tint is absent from the plumage during breeding. The wing coverts and back feathers are paler and have an almost white terminal band.
The bare facial skin is greyish or dark maroon; with black, irregular blotches.[4] During breeding, the bare facial skin is deep wine red with black markings on the lores by the bill base and gular region, with a ring of brighter red skin around the eye. Soon after courtship, the facial skin fades to paler orange-red. Breeding birds also show a narrow pinkish band of bare skin along the underside of the wing.
The downcurved bill is dull pinkish yellow and sometimes tipped white. The culmen length measures 194 – 275mm. The legs are a dull red-flesh colour, with the tarsi measuring 188 – 225mm. It has long thick toes that probably serve to increase surface area of its feet and therefore reduce pressure from standing and walking on the soft mud of its foraging area, so that the bird does not sink considerably when foraging and feeding.
During courtship, the bill turns deep yellow, with a greyish tan on the basal third; and the legs become deep magenta. The sexes are similar, but the average male is slightly larger with a longer, thinner bill.
The adult is readily recognisable in the field by its white head feathers, yellow-orange bill and pink legs. It is distinguished from other waders such as egrets and lesser adjutants by its extensively white body plumage and black wing coverts. However, the milky stork resembles and may therefore be confused with the partly sympatric Asian Openbill and various white egret species.Nevertheless, the egrets are smaller and completely white, and the Asian Openbill is also smaller and distinguished from the milky stork by the grey bill. In the northern part of its range around Vietnam, milky storks occasionally occur in sympatry with the closely related and morphologically similar painted storks. However, the painted stork is distinguished from the milky stork in adult plumage by the former’s black and white breast band and wing coverts, pink inner secondaries, more restricted bare head skin, and generally brighter soft part colouration.
Like other storks, the milky stork usually soars on thermals to travel between areas. Flocks of up to a dozen birds can be seen soaring on thermals at great heights between 10:00 and 14:00. At breeding colonies and feeding grounds, flight is contagious in that take-off by one bird is quickly followed by others. Average flapping rate has been estimated at 205 beats per minute.