Ch 3: Sexual dimorphism
Sexual dimorphism refers to differences between males and females in appearance and behavior. Across the range of species on earth, some are highly sexually…
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"A Greater Sage-grouse male displays for a female on a lek in Sublette County, Wyoming. The birds put on an elaborate display on leks, or mating grounds in spring, often in areas threatened by energy development. The species is in rapid decline and determined to be "warranted, but precluded" from protection under the Endangered Species Act. Photo by Dave Showalter."
"The birdwing swallowtails from tropical Asia are some of the largest, most spectacular, and most endangered butterflies in the world. All show high levels of sexual dimorphism (i.e., males and females are different in size and color). Female birdwings are larger and much duller in color than the males, which come in glowingly iridescent colors of brilliant sapphire, emerald, and topaz."