2024年8月20日 · Courtship Forced copulations by subadult males is used to establish dominance; pregnancy rarely results. Cooperative copulations between subadult males and females has also been observed.

The orangutan mating system is based on a mixture of female choice and male harassment and coercion. Scientists believe that this fierce competition for female mating opportunities has resulted in extreme sexual dimorphism and arrested development in orangutan societies.

Like all animals, an important part of the reproduction process for orangutans is courtship. Adult males can be divided into two groups: flanged (those with cheek pads) and unflanged. The flanged ones are more desired by females while unflanged …

Courtship and Mating Behavior of Wild Orangutans in Sumatra C.L. Schiirmann 1 All field studies describe the orangutan as an animal with a predOminantly solitary life style and a low frequency of social interaction. It is not really surprising therefore that, despite all the field work in the past 15 years, literature still provides little factual

Between June 1975 and April 1979 I studied a wild orangutan population in Ketambe in the Gunung Leuser Reserve in Sumatra. The study focused on the animals’ social behavior and as part of this study I was extremely lucky to have the opportunity in the field to make an extensive detailed observation of courtship and mating behavior.

2009年5月1日 · Orangutans are a species with a very pronounced sexual dimorphism, in that fully grown males are about twice the size of females, but adult, sexually mature males come in two distinct morphs. Unflanged males lack the secondary sexual characteristics (e.g., cheek flanges, throat sack, long call) of the flanged males, but are sexually active ...

Due to extremely long interbirth intervals, orangutans have highly male-skewed operational sex ratios and thus intensive male-male competition for every conception. Paternity analyses matched 21 immature Bornean orangutans with their most likely sire (only 10 of 50 genotyped males) in a natural population.

2014年3月5日 · Due to the closely related genetic make up of the two species of orangutans, it is possible for them to breed with each other. This sometimes happens in captivity but doesn’t in the wild due to the separation of them geographically. The offspring that are part of the two species seem to do very well.

2009年11月7日 · Currently two orangutan species are recognized: Pongo abelii representing the Sumatran lineage and Pongo pygmaeus representing the Bornean lineage. Dividing the orangutan into two species was much debated in the 1990s, but this separation of species is supported by genetic analysis and a general attitude of “taxonomic inflation” in primatology.

Here, we examine mating dynamics in Bornean orangutans (Pongo pygmaeus) in order to understand whether such female counterstrategies are expressed in a species with demonstrated extremes of sexual dimorphism and sexual coercion. Orangutan males occur in two sexually mature morphs: flanged and unflanged.