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Zoo orangutans exhibit more frequent and diverse exploratory object manipulations (EOM) than their wild counterparts. This suggests the zoo environment enhances orangutan exploratory behavior, potentially boosting cognitive flexibility.

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Area of Science:

  • Primatology
  • Cognitive Ethology
  • Evolutionary Psychology

Background:

  • Exploratory object manipulations (EOM) are crucial for cognitive development in humans.
  • Zoo-housed great apes are vital models for studying human cognitive evolution.
  • The impact of zoo environments on orangutan EOM remains largely unexplored.

Purpose of the Study:

  • To investigate differences in daily EOM between wild and zoo-housed Sumatran orangutans across their lifespan.
  • To compare the diversity and repertoire of exploratory actions in both settings.
  • To assess the influence of the zoo environment on orangutan exploratory potential.

Main Methods:

  • Collected approximately 12,000 EOM events from 51 wild and zoo-housed Sumatran orangutans of all ages.
  • Observed and categorized EOM behaviors, including object exploration and tool use.
  • Compared EOM rates, diversity, repertoire, and multi-object exploration between wild and captive individuals.

Main Results:

  • Zoo-housed orangutans displayed significantly higher EOM rates compared to wild orangutans.
  • Exploratory actions were more diverse in zoos, with a larger repertoire observed.
  • Zoo orangutans showed a greater probability of multi-object exploration, including tool use, irrespective of object availability.

Conclusions:

  • The zoo environment significantly enhances EOM in Sumatran orangutans, exceeding their natural expression.
  • Captive orangutans may possess a broader range of cognitive affordances due to increased exploratory experience.
  • Captive-wild comparisons offer valuable insights into cognitive development and evolutionary potential.