oil-gland

After this touch the bill, orbits, feet, and former oil-gland at the root of the tail with the solution, and then you have given to the hawk everything necessary, except attitude and a proper degree of elasticity -- two qualities very essential.

Practical Taxidermy A manual of instruction to the amateur in collecting, preserving, and setting up natural history specimens of all kinds. To which is added a chapter upon the pictorial arrangement of museums. With additional instructions in modelling and artistic taxidermy. Montagu Browne

They are not only light and strong, but warm, and by their means, as a bird soars into colder regions of air, it is protected from the cold: while for aquatic birds there is a special provision -- by pressing with their beaks an oil-gland near the tail they can waterproof their feathers!

Twilight and Dawn Simple Talks on the Six Days of Creation Caroline Pridham

The fantail has thirty or even forty tail-feathers, instead of twelve or fourteen—the normal number in all the members of the great pigeon family: these feathers are kept expanded, and are carried so erect, that in good birds the head and tail touch: the oil-gland is quite aborted.

I. Variation under Domestication. Breeds of the Domestic Pigeon, Their Differences and Origin 1909

And I seemed to see them all again playing about, and passing their heads over their backs, and rubbing the points of their beaks in the oil-gland to make their plumage keep off the water.

Mass' George A Boy's Adventures in the Old Savannah George Manville Fenn 1870

The fantail has thirty or even forty tail-feathers, instead of twelve or fourteen, the normal number in all members of the great pigeon family; and these feathers are kept expanded, and are carried so erect that in good birds the head and tail touch; the oil-gland is quite aborted.

On the Origin of Species~ Chapter 01 (historical) Charles Darwin 1859

The fantail has thirty or even forty tail-feathers, instead of twelve or fourteen, the normal number in all members of the great pigeon family; and these feathers are kept expanded, and are carried so erect that in good birds the head and tail touch; the oil-gland is quite aborted.

On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life 1859

The fantail has thirty or even forty tail feathers, instead of twelve or fourteen, the normal number in all members of the great pigeon family; and these feathers are kept expanded, and are {22} carried so erect that in good birds the head and tail touch; the oil-gland is quite aborted.

On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition) Charles Darwin 1845

I have tried with all twelve birds three standards of measurement, namely, the length from the base of the beak to the oil-gland, to the end of the tail, and from the extreme tip to tip of wings.

The Variation of Animals and Plants Under Domestication, Vol. I. Charles Darwin 1845

The oil-gland varies in development, and is sometimes quite aborted.

The Variation of Animals and Plants Under Domestication, Vol. I. Charles Darwin 1845

The fantail has thirty or even forty tail-feathers, instead of twelve or fourteen, the normal number in all members of the great pigeon family; and these feathers are kept expanded, and are carried so erect that in good birds the head and tail touch; the oil-gland is quite aborted.

On the origin of species Charles Darwin 1845