Postcard - Adult Male Orang Utan

$1.00
Adult male orang utan exhibit 2 kinds of physical development as flanged and unflanged.  The flanged adult male orang utan after about 15 years old may start their "Secondary Sexual Characteristic".  This includes having cheek pads (flanges), throat porch, long hair, and the ability to make long loud calls.  A flanged male establish & protect their territories that do not overlap with other flanged males' territories and advertise to the female by giving a "long calls" that carry a long way in the forests. 
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