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Drinking birds, also known as dunking birds, drinky birds, water birds, or dipping birds [1] [2] [3] are toy heat engines that mimic the motions of a bird drinking from a water source. They are sometimes incorrectly considered examples of a perpetual motion device.
Puddle ducks spring straight up from the water, but diving ducks need to gain momentum to take off, so they must run across the water a short distance to gain flight. Traditionally, most ducks were assigned to either the shelducks , the perching ducks , and the dabbling and diving ducks ; the latter two were presumed to make up the Anatinae.
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Grey teal ducklings tend to be at higher risk of predation than adults. Other aviator predators pose a threat as they are known to take ducklings out of nests from approaching above. [3] When in the water ducklings are at risk from eels, rats and swamp harriers as they have been known to predate when the ducklings are swimming. [10]
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Cairina moschata domestica head detail. All Muscovy ducks have long claws on their feet and a wide, flat tail. In the domestic drake (male), length is about 86 cm (34 in) and weight is 4.6–6.8 kg (10–15 lb), while the domestic hen (female) is much smaller, at 64 cm (25 in) in length and 2.7–3.6 kg (6.0–7.9 lb) in weight.
American Pekin flock. The Pekin or White Pekin is an American breed of domestic duck, raised primarily for meat. [6] [7] It derives from birds brought to the United States from China in the nineteenth century, [8] and is now bred in many parts of the world. [6]
The female broods the ducklings on the nest for up to 24 hours before leading the ducklings to water. The ducklings are immediately capable of diving to feed. The female guards the brood during the fledging period of around 75 days. Occasionally, rafts are formed by several females and their ducklings; these can have up to 50 birds. [12]