Orangutans Most Energy Efficient Primates

Researchers from Washington University studied orangutan energy levels and concluded they are the most energy efficient of the primates, including sedentary humans. Their study noted the surprising find, “Such an extremely low rate of energy use has not been observed previously in primates.”

Herman Pontzer, one of the researchers said, “You and I sitting in front of our computers use more energy each day than these orangutans that are walking around, and climbing around and socializing around their big enclosures.”

The researchers used slightly altered water to measure metabolic rate. Non-radioactive isotopes such as deuterium and oxygen-18 were used in place of hydrogen and oxygen to make a water-like liquid. The animals consumed the liquid, and the uncommon isotopes were measured in the elimination. This technique, the doubly-labeled water method, has been used in over 200 species of animals, including humans.

Orangutans were studied at an animal park in Des Moines called the Great Ape Trust. The subjects were found to use about 30 percent less energy than expected relative to their mass (Males range from 150-200 lbs. and females 50-100). The activity level of the orangutans studied in the animal park was deemed similar to that of wild ones. Wild orangutans spend most of their time in trees looking for food and eating. They also can spend twelve hours a day sleeping. The researchers have suggested that orangutans have evolved to have a slower metabolic rate to survive in a habitat which at times provides little-to-no fruit due to seasonal fluctuations.

The orangutans cover a fairly wide range of trees in order to find enough to eat. They actually spend little time on the ground, and are not adept at walking. It is also thought they could be the least prolific, or one of the least prolific mammals reproductively.

Image Credit: Arctic Gnome

586 comments

LMj Sunshine

Thank you for article and video.

LMj Sunshine

Thank you for article and video.

Brenda Towers
Brenda Towers5 years ago

Thanks for the video.

colleen prinssen
colleen p.5 years ago

oh yes, lets emulate an animal with biology different than ours.
like say we don't need 8 glasses of water a day because desert tortoise dosen't

Michela M.
Michela m.5 years ago

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Olena K.
Olena K.6 years ago

Very interesting article, and the video is lovely!! Thanks for sharing. ;o)

Linda J.
Linda J.6 years ago

Thanks

Jan C.
j C.6 years ago

With all our "energy efficiency," humans could never be this cute!

Laura S.
Laura S.6 years ago

Well, what do you know?

Carole H.
Carole Hagen6 years ago

READ!