The fur colour is a mixture of brownish-gold, grey, and black on its back and head and yellow, orange, and tawny on its underparts. The average adult body weight is just over 100 g (3.5 oz) with the only sexual dimorphism of females being a little heavier. Pygmy marmosets are the world's smallest primates, being the smallest true monkey, with a head-body length ranging from 117 to 152 mm (4.6 to 6.0 in) and a tail of 172 to 229 mm (6.8 to 9.0 in). This involves large decreases in prenatal and postnatal growth rates, furthering the thought that progenesis played a role in the evolution of this animal. The evolution of this genus diverged in terms of body mass from typical primates, with a high rate of body-mass reduction.
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