Bird - Female Mallard duck with ducklings 2006 postcard

Postcard

 

• Picture / Image:  Female mallard with young
• Publisher:  Wildfowl and Wetlands Trust (WWT)
• Postally used:  no
• Stamp:  n/a
• Postmark(s):  n/a
• Sent to:  n/a
• Notes & Key words: 

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Postage & Packing:

UK (incl. IOM, CI & BFPO): 99p

Europe: £1.60

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NOTE: All postcards are sent in brand new stiffened envelopes which I have bought for the task. These are specially made to protect postcards and you may be able to re-use them. In addition there are other costs to sending so the above charge is not just for the stamp!

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Text from the free encyclopedia WIKIPEDIA may appear below to give a little background information:

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The Mallard (Anas platyrhynchos^[1]), probably the best-known and most recognizable of all ducks, is a dabbling duck which breeds throughout the temperate and sub-tropical areas of North America, Europe, Asia, Africa, New Zealand (where it is currently the most common duck species), and Australia. It is strongly migratory in the northern parts of its breeding range, and winters farther south. For example, in North America it winters south to Mexico, but also regularly strays into Central America and the Caribbean between September and May.^[2]

The Mallard is the ancestor of all domestic ducks, except the few breeds derived from the unrelated Muscovy Duck (Cairinia moschata).^[3][4]

The Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies to the mallard.

The Mallard is 56–65 cm long, has a wingspan of 81–98 cm, and weighs 0.9–1.2 kg. The breeding male is unmistakable, with a green head, black rear end and a yellowish orange (can also contain some red) bill tipped with black (as opposed to the dark brown bill in females). The female Mallard is light brown, like most female dabbling ducks. However, both the female and male Mallards have distinct purple speculum edged with white, prominent in flight or at rest (though temporarily shedded during the annual summer molt). In non-breeding (eclipse) plumage the drake becomes drab, looking more like the female, but still distinguishable by its yellow bill and reddish breast.

The Mallard is a rare example of both Allen's Rule and Bergmann's Rule in birds. Bergmann's Rule, which states that polar forms tend to be larger than related ones from warmer climates, has numerous examples in birds. Allen's Rule says that appendages like ears tend to be smaller in polar forms to minimize heat loss, and larger in tropical and desert equivalents to facilitate heat diffusion, and that the polar taxa are stockier overall. Examples of this rule in birds are rare, as they lack external ears. However, the bill of ducks is very well supplied with blood vessels and is vulnerable to cold.

The size of the Mallard varies clinally, and birds from Greenland, although larger than birds further south, have smaller bills and are stockier. It is sometimes separated as subspecies Greenland Mallard (A. p. conboschas).

In captivity, domestic ducks come in wild-type plumages, white, and other colours. Most of these colour variants are also known in domestic mallards not bred as livestock, but kept as pets, aviary birds, etc., where they are rare but increasing in availability.

A noisy species, the male has a nasal call, the female has a "quack" stereotypically associated with ducks.^[5]