preen oil造句

• I'd actually theorized that this may be the smell of the preen oil / wax.
• Once the duckling grows its own feathers, it will produce preen oil from the sebaceous gland near the base of its tail.
• To retain the softness and silent flight, the barn owl cannot use the preen oil or powder dust that other species use for waterproofing.
• The feathers of a young duckling are not sufficiently developed to properly protect them for extended periods in the water and they do not produce enough preen oil to waterproof this plumage.
• In the wild, a mother duck will monitor the time her ducklings spend in the water as well as supplying additional preen oil to supplement what is produced by the hatchlings.
• The feathers coated with the preen oils look brighter and the degree to which the plumage was glossy was a way in which mates could determine the diet or overall health of the individual.
• However, young ducklings rely on their mothers for a supply of preen oil to make them waterproof; a chicken hen does not make as much preen oil as a female duck, and an incubator makes none.
• However, young ducklings rely on their mothers for a supply of preen oil to make them waterproof; a chicken hen does not make as much preen oil as a female duck, and an incubator makes none.
• The purpose of this behavior is unknown, but it is thought that the birds may be able to acquire defensive secretions from the ants possibly used for some medicinal purposes, or that it simply supplements the birds'own preen oil.
• A bird will typically transfer preen oil to its body during preening by rubbing its beak and head against the gland opening and then rubbing the accumulated oil on the feathers of the body and wings, and on the skin of the feet and legs.
• "In vitro " studies suggest that the preen oils of rock doves ( " Columba livia " ) are effective against lice, however " in vivo " studies which removed the preen gland from captive birds had no significant effect on louse loads over the course of four months ( but did reduce plumage quality ), suggesting that preen oil may not be an important defense against lice in this species.
• "In vitro " studies suggest that the preen oils of rock doves ( " Columba livia " ) are effective against lice, however " in vivo " studies which removed the preen gland from captive birds had no significant effect on louse loads over the course of four months ( but did reduce plumage quality ), suggesting that preen oil may not be an important defense against lice in this species.