A genus of small primates from South America, commonly called marmosets, known for their diminutive size, long tails, and elaborate facial markings.
From Greek 'kallos' (beauty) + 'thrix' (hair), literally 'beautiful hair.' Named to describe the distinctive hair patterns and facial tufts of these small monkeys.
Callithrix marmosets are among the tiniest primates alive—a pygmy marmoset weighs less than a chocolate bar—yet they're incredibly intelligent and live in complex family groups with specialized roles, showing that brain power doesn't require body size.
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