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Primatologists described an episode among Bornean orangutans (Pongo pygmaeus wurmbii) wherein Ekko, a male, sexually inspected Sidony, an old female, then changed his mind and began to mate with Kondor, a young female, who broke off sex in order to attack Sidony, in which effort she was assisted by Ekko until Guapo, another male, chased off Ekko and, amid further attacks by Kondor, mated with Sidony, who later died.

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Primatologists described an episode among Bornean orangutans (Pongo pygmaeus wurmbii) wherein Ekko, a male, sexually inspected Sidony, an old female, then changed his mind and began to mate with Kondor, a young female, who broke off sex in order to attack Sidony, in which effort she was assisted by Ekko until Guapo, another male, chased off Ekko and, amid further attacks by Kondor, mated with Sidony, who later died.

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