caruncle

The caruncle remains on the beak for a variable length of time, but never is present in the spring following hatching.

From Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz by Legler, John M.

In the breeding season the male is black and has a fleshy red caruncle, or horn, on the top of its head.

From The Gutenberg Webster's Unabridged Dictionary Section T, U, V, and W by Project Gutenberg

Many of both sexes were furnished with a large, round, fleshy caruncle on the bill at the base of the forehead--this is said to be present during the breeding season only.

From Narrative of the Voyage of H.M.S. Rattlesnake, Commanded By the Late Captain Owen Stanley, R.N., F.R.S. Etc. During the Years 1846-1850. Including Discoveries and Surveys in New Guinea, the Louisiade Archipelago, Etc. to Which Is Added the Account of Mr. E.B. Kennedy's Expedition for the Exploration of the Cape York Peninsula. By John Macgillivray, F.R.G.S. Naturalist to the Expedition. — Volume 1 by MacGillivray, John

Almost every caruncle present after 50 days could be flicked off easily with a probe or fingernail.

From Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz by Legler, John M.

Stems several from a hard rootstock, 1° high; leaves narrowly linear, 3–12´´ long, acute; wings oblong-obovate; crest small; lobes of the caruncle half the length of the appressed-silky seed.—Neb. and Kan. to Tex.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Gray, Asa