An oil producing gland on the tail of some birds is known as

Concept:Introduction to the class Aves: All the birds are included in the class Aves.Their body is boat-shaped and divided into head, neck, trunk & tail.Their body is covered with soft feathers called ''plumage''Birds are warm-blooded animals or homeothermic i.e. their temperature remains constant with respect to the OUTSIDE temperature.They are subdivided into two sub-classes: a.) Archaeornithes b.) NeornithesExplanation:The Skin of birds is dry without glands except the oil gland at the base of the tail called the Preen gland.It is also known by the name Uropygial gland, it secretes the oil-containing SUBSTANCES made up of monoester waxes, fatty acids, and monohydroxy wax-alcoholsThe bird transfer preens 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. Green glands are excretory organs of some arthropods LIKE crustaceans.They are called antennal glands or maxillary glands, depending on whether they open at the base of the antennae or at the maxillae.If the tubule adjacent to the excretory pore is green, the gland is called a green gland.Mucous glands, also known as muciparous glands, are FOUND in several different parts of the body, and they typically stain lighter than serous glands during standard histological preparation. Most are multicellular, but goblet cells are single-celled glands.The sebaceous glands are found in the skin of the human body. They are microscopic exocrine glands that open into the skin's hair follicle and secretes an oily & waxy matter called the sebum.They occur on all parts of the skin except the sole of the feet and palm of the hands.Sebaceous glands are present in maximum number in the scalp & skin area.