Bull elk (Cervus canadensis) may have five to eight or more tines on each antler; however, the number of tines has little to do with the age or maturity of a particular animal. The formation and retention of antlers is testosterone-driven. After the breeding season in late fall, the level of pheromones released during estrus declines in the environment and the testosterone levels of males drop as a consequence. This drop in testosterone leads to the shedding of antlers, usually in the early winter.<br /> Swan Lake Flats, Yellowstone.
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