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Stroking is used to apply preen oil, as well as to dry and smooth plumage. Grebes stroke more vigorously with an open bill – a behaviour known as "stropping". [26] Penguins use their whole heads to stroke, in a motion referred to as "wiping". [14] Birds regularly fluff up their plumage and repeatedly shake their bodies while preening.
To do that, they use the preen oil secreted by the uropygial gland, the dust of down feathers, or other means such as dust-bathing or anting. During oil spills, animal conservationists that rescue penguins sometimes dress them in knitted sweaters to stop them from preening and thereby ingesting the mineral oil, which is poisonous. Monkeys may ...
Preen gland, also called the uropygial gland, an oil gland found in many bird species Preen oil, an oil made by the uropygial gland found in many bird species Products
Position of the uropygial gland, indicated on a budgerigar Uropygial gland of a blue jay. The uropygial gland, informally known as the preen gland or the oil gland, is a bilobed sebaceous gland possessed by the majority of birds used to distribute the gland's oil through the plumage by means of preening.
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A form of social grooming among birds, in which one bird preens another or a pair does so mutually. At times it may be used to redirect or sublimate aggression, such as one bird assuming a solicitation posture to indicate its non-aggression and invite allopreening by the aggressive individual.
In fish, this often refers to the presence or absence of a stomach: precocial larvae have one at the onset of first feeding whereas altricial fish do not. [1] Depending on the species, the larvae may develop a functional stomach during metamorphosis (gastric) or remain stomachless (agastric).
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