Protected Bird - Gibraltar 1991

On May 30, 1991, Gibraltar Post collaborated with WWF organization released the stamp series features protected bird species, such as : Black stork, Egyptian vulture, Barbary partridge, and Shag or European Shag . Alongside with the issuance of WWF stamps, Gibraltar Post issued the official FDC depicted coloured silhouette of all birds and have a post mark of WWF logo, Panda.

Black Stork
The Black Stork or Ciconia nigra is a large wading bird in the stork family Ciconiidae.This is a shy and wary species. It is seen in pairs or small flocks—in marshy areas, rivers or inland waters. The Black Stork feeds on amphibians and insects.
The Black Stork is a strong migrant, wintering in tropical Africa and India.The storks migrate from the middle of August to the end of September.The common route goes over Gibraltar.The Black Stork builds a stick nest high in trees.
Egyptian Vulture

Egyptian Vultures are widely distributed and may be found in Southern Europe, in Northern Africa, and in Western and South Asia. The adult plumage is white, with black flight feathers in the wings.  The bill is slender and long and the tip of the upper mandible is hooked.

Their habitat is mainly in the dry plains and nest mainly in arid and rocky hill regions.Populations of this species have declined in the 20th Century and some isolated island forms are particularly endangered.

Barbary partridge

The Barbary Partridge (Alectoris barbara), is a gamebird in the pheasant family Phasianidae of the order Galliformes, gallinaceous birds.The Barbary Partridge is the national bird of Gibraltar.

Barbary partridge has its main native range in North Africa, and is also native to Gibraltar and the Canary Islands .It is a resident breeder in dry, open and often hilly country and has measures about 33-36 cm in length.The Barbary Partridge takes a wide variety of seeds and some insect food. It nests in a scantily lined ground scrape laying 10-16 eggs.

The Barbary Partridge is a rotund bird, with a grey-brown back, grey breast and buff belly. The face is light grey with a broad reddish-brown gorget. It has rufous-streaked white flanks and red legs. 

 
Shag

The European Shag or Common Shag (Phalacrocorax aristotelis) is a species of cormorant and  endemic to the northeast Atlantic and the Mediterranean. They feed a wide range of small fish that it catches on or near the seabed over both sandy and rocky substrates.The species nests on offshore islands or on cliffs, and colonies range in size from a few to several thousand pairs.