Leaves contain rows of oil glands on the lower surface.

Feet have fewer oil glands than other parts of the body, which makes them especially susceptible to dry air.

Their surfaces often have visible oil glands and short hairs.

At the same time, the areas that lack oil glands can become dry and flaky.

We have five tips for those of you whose oil glands are out of control.

Oil glands in your body produce a compound called sebum.

Estrogen is critical in the production of oil glands and collagen.

"Fats get thick and can't move out of the oil glands.

There are oil glands present at the base of the leaf stipules.

Oil glands are larger in your face, so that's predominantly where flare-ups occur.

The leaves of all species of marigold include oil glands.

As in other members of the myrtle family, eucalyptus leaves are covered with oil glands.

Oil glands in the face are usually more active in guys than girls, so your acne can be worse.

A boil is a skin infection that starts in a hair follicle or oil gland.

Appearing usually on the nose and face, they're caused by skin flakes blocking oil glands.

Oil glands are part of the body's integumentary system and serve to protect the body against germs.

These mites are located in the hair follicle and oil glands of the skin.

The oil glands are lacking compared with healthy leaf.

The oil glands gradually produce less oil, making the skin drier than before.

Each pore is an opening to a follicle, which contains a hair and an oil gland.

The plants are related to the citrus family, and have oil glands in the leaves which give off a distinctive aroma.

During puberty, your oil glands go into overdrive, causing acne.

A chalazion forms when an oil gland in the eyelid becomes blocked.

Certain gram positive bacteria can be associated with oil glands that play a role in acne and skin disease.

Unlike skin on the rest of your face, the eye area does not contain oil glands that can help keep this skin moist.

Like most other ratites, they have no preen gland.

They do not have retrices (tail feathers) or a preen gland.

They have dense plumage with a large preen gland for waterproofing their feathers.

The yellow bill colors of many hornbills are produced by preen gland secretions.

Like cormorants, they have a vestigial preen gland and their plumage gets wet during diving.

All cormorants have preen gland secretions that are used ostensibly to keep the feathers waterproof.

The male spreads the preen gland secretion which is yellow onto the primaries and bill to give them the bright yellow colour.

Adult ratites have no preen gland (uropygial gland) that contains preening oil.

The physical condition of feathers are maintained by preening often with the application of secretions from the preen gland.

It has no preen gland, and its feathers have no aftershafts and no barbules.

The plumage of the Crested Oropendola has a musty smell due to the oil from the preen gland.

Its sternum has no keel, its wings are minimal, and it has no preen gland.

Tinamous' possession of powder-down feathers and preen glands, which the ratites lack, is another distinguishing characteristic between the two orders.

Apart from ingesting the material, they also chew it, mix it with preen gland oil and apply it to their feathers.

In social seabirds, the preen gland is used to mark nests, nuptial gifts, and territory boundaries with behavior formerly described as 'displacement activity'.

They produce very little oil from their preen gland; it is the air trapped in their dense plumage that prevents them from becoming waterlogged.

They have no feather vanes, which means they do not need to oil their feathers, hence they have no preen gland.

They owe their buoyancy to their proximity to the ducks preen gland which secretes an oil distributed by the duck as a cleaning and waterproofing measure.

They rub the backs of their heads on their preen glands to pick up an oily secretion, which they transfer to their plumage to waterproof it.

The uropygial gland, informally known as the preen gland or the oil gland, is a bilobate sebaceous gland possessed by the majority of birds.

Unlike their relatives (the darters and cormorants), sulids have a well-developed preen gland whose waxy secretions they spread on their feathers for waterproofing and pest control.

As it grows it is golden yellow, but the bird rubs its casque on its preen gland, whose oily secretion tints the surface of the casque bright red.

They carved the casques, or they made them into sheets, coloured them with the secretion of the preen gland, and made them into belt buckles for high officials.

Cul De Canard - feathers from the back of the of a duck directly around the preen gland; they are very buoyant due to preen oil produced by the preen gland.

It and the bill are yellow; the red secretion of the preen gland covers the sides and top of the casque and the base of the bill, but often leaves the front end of the casque and the distal half of the bill yellow.