Monday, October 1, 2012
PAKISTAN WILDLIFE SERIES MIGRATORY BIRDS IN PAKISTAN (2012-19)
Migratory Birds in Pakistan Wild Life Series Commemorative Postage Stamps September 27, 2012:- Siberian Crane Order: Gruiformes. Family : Gruidae:- Siberian Cranes are widely dispersed in their breeding areas and rare highly territorial. They maintain feeding territories in winter but many form small and loose flocks, and gather closer at their winter roosts. They are very diurnal, feeding almost all through the day and their migration is done. When feeding on submerged vegetation, they often immerse their heads entirely underwater. When calling the birds stretch their neck forward. The context of several calls have been identified and several of these vary with sex. Individual variation is very slight and most calls have a dominant frequency of about 1.4khs. the unison calls duets between paired males and female however are more distinctive with marked differences across pairs. The female produces a higher pitched call which is the “loo” in the duetted “doodleloo” call. Pairs with walk around other pairs to threaten them and drive them away from their territory. In captivity, one individual was recorded to have lived for nearly 62 years while another lived for 83 years.
White Stork Order: Ciconiiformes. Famiy : Cicniidae:- The White Stork is a large bird. It has a length of 100-115 cm (39-45 in) and a standing h4eight of 100-125 cm (39-49 in). The wingspan is 155-215 cm (61-85 in) and its weight is 2.3-4.4 kg (5.1-9.7 lb). Like all storks, it has long legs, a long neck, and a long, straight, pointed beak.
The sexes are indentical in appearance, except that males are larger than females on average. The plumage is mainly white with black flight feathers and wing coverts; the black is caused by the pigment melanin. The breast eathers are long and shaggy forming a ruff which is used in some sourtship displays. The irises are dull brown a bright red beak and red legs, the coloration of which is derived from carotenoids in the diet. In parts of Spain, studies have shown that the pigment is based on astazanthin obtained from an introduced species of cray fish (Procambarus clarkia) and the bright red beak colours show up even in nestlings, in contrast to the duller beaks of young White Storks elsewhere.
Snow Geese Order: Anseriformes. Family : Anatidae:- The Snow Geese has two color plumage morphs white (snow) or gray / blue (blue), thus the common description as snows and blues.
White morph birds are white except for black wing tips but blue morph geese have bluish grey plumage replacing the white except on the head neck and tail tip. The immature blue phase is drab or slate-gray with little to no white on the head, nick or belly. Both snow and blue phase have rose-red feet and legs, and pink bills with black tomia (cutting edges) giving them a black “grin patch”. The colors are not as bright on the feet, legs and bill of immature birds. The head can be stained rusty-brown from minerals in the soil where they feed. They are very vocal and can often be heard from more than a mile away.
Shoveler Duck Order : Anseriformes. Family : Anatidae:- This species is unmistable in the northern hemisphere due to its large spatulate bill. The bredding dark has an iridescent dark green head, white breast and chestnut belly and flanks. In flight, pale blue forewing feathers are revealed, separated from the green speculum by white border. In early fall the male will have a white crescent on each side of the face.
Non-breeding (eclipse) plumage, the drake resembles the female. The female is a drab mottled brown like other dabblers, with plumage much like a female Mallard, but easily distinguished by the long broad bill, which is gray tinged with orange on cutting edge and lower mandible. The female’s forewing is gray.
On Migratory Birds in Pakistan (Wild Life Series), Pakistan Post is issuing a set of four commemorative postage stamps each denomination of Rs.8/- on September 27, 2012.