The same hypothesis also applies to an extinct adapid primate which possessed a very large baculum.īaculum copulatory behavior primate evolution.Ĭopyright © 1987 Wiley‐Liss, Inc., A Wiley Company. Use them in commercial designs under lifetime, perpetual & worldwide rights. India, Thailand and South Korea are found at the bottom, with average sizes between 9.3 and 10.5 centimetres. The evolutionary significance of these observations is discussed and it is suggeted that similar copulatory patterns may occur in species with elongated bacula (eg, Daubentonia, Perodicticus) for which behavioral data are lacking at present. Human males weigh about half of what gorillas do, but studies peg average erect or flaccid-but-stretched penis length from 4.7 inches (12 cm) to 6.5 inches (16.7 cm). In reality, gorilla penises are tiny 1 inches long is the. The presence of an elongated baculum was shown to correlate with copulatory patterns involving prolonged intromission and/or the maintenance of intromission during the postejaculatory interval (eg, Galago crassicaudatus, Loris tardigradus, M, arctoides). Note 2: The large size of the gorilla penis depicted in this story is purely fictitious. A comparison of baculum length relative to body weight was made in 34 species for which detailed information on copulatory behavi or was available. Very long bacula are found in some nocturnal prosimians (eg, Lorisidae) and also in Macaca arctoides. Among the great apes, reduction of the baculum is more pronounced in Pan and Gorilla than in Pongo. The baculum is shorter in colobine monkeys than in cercopithecines.
Thus, many New World monkeys have shorter bacula, relative to body weight, than Old World monkeys. These data, and a review of previously published measurements, indicate that variation in baculum length among primates is related to taxonomic and behavioral differences. The length of the baculum (os penis) was measured in 74 adult males representing 46 primate species.
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