4. Emus

CREDIT: ©-robynmac-Depositphotos
Emus travel together in pairs. Male emus have been seen making the same mating behaviours as female do to males. This includes: circling a passive male, patches of bare skin turning light blue (on both males), the passive male stretching his neck, erecting his feathers and swaying from side to side and the dominant male rubbing his breast against the other male’s rump.
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