The enlarged temporal glands of males in full musth. Older, higher-ranking musth males secrete more heavily and persistently from these swollen glands. Located mid-way between the ear and the eye, enlarged glands cause the heads of musth males to appear even larger and more impressive.
References: Poole & Moss 1981; Poole 1982: 48, illustration 4.2; Poole 1987a. (Full reference list)
This behavior occurs in the following context(s): Advertisement & Attraction