Baby Sumatran Orangutans Cling So Tightly They Can Hang Upside Down for Minutes

A newborn ape can dangle upside down without falling.

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Newborn orangutans weigh only a few pounds but can support their full body weight by clinging to fur.

Infant Sumatran orangutans are born with exceptionally strong grasp reflexes. Within hours of birth, they cling to their mother's fur as she climbs vertically through trees. Their survival depends on maintaining grip at heights that can exceed 60 feet. A slip would be fatal, yet the infant's hands and feet lock with remarkable tenacity. This reflex mirrors survival mechanisms seen in other arboreal primates but is extended due to prolonged dependency. Mothers rarely place infants down during the first months of life. The vertical world becomes their cradle.

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In dense rainforest, movement is continuous and often precarious. Mothers navigate unstable branches while carrying a dependent infant that weighs a significant fraction of their body mass. The infant's grip must withstand sudden shifts in balance and branch sway. This early exposure conditions muscle strength and coordination. Survival from day one depends on biomechanical precision at canopy height. The margin for error is nearly zero.

As forests fragment and canopy gaps widen, the risks intensify. Longer leaps between trees increase instability for mothers carrying infants. Any increase in canopy disruption multiplies fall risk for the youngest members of the population. Habitat degradation therefore impacts survival from the very first days of life. The infant grip that once guaranteed safety becomes less reliable in a broken forest.

Source

Smithsonian National Zoo

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