Woman with buns and blue sweater chewing gum, smiling, and stretching pink gum out of her mouth. 
The Energetic Cost of Chewing May Have Shaped Hominin Evolution
The simple act of chewing gum can raise the body’s metabolic rate by as much as 15 percent, a study finds.
The Energetic Cost of Chewing May Have Shaped Hominin Evolution
The Energetic Cost of Chewing May Have Shaped Hominin Evolution

The simple act of chewing gum can raise the body’s metabolic rate by as much as 15 percent, a study finds.

The simple act of chewing gum can raise the body’s metabolic rate by as much as 15 percent, a study finds.

chimpanzee
One chimpanzee grooming another on its chin
Chimps Appear to Treat Others' Wounds Using Insects
Natalia Mesa | Feb 7, 2022
The practice, which hasn’t been previously observed among nonhuman animals, may be a display of empathy. 
macaque in zoo enclosure
Leading Japanese Primate Research Center is Closing
Chloe Tenn | Oct 19, 2021
Kyoto University is shuttering its Primate Research Institute after its director was dismissed for misuse of funding.
Trixie Gardner (left) and Allen Gardner (right) spend time interacting with Washoe (center).
R. Allen Gardner, Who Taught Chimps to Sign, Dies at 91
Lisa Winter | Oct 5, 2021
Gardner famously claimed to have taught chimpanzees to communicate with people using American Sign Language by raising them as if they were human children.
tibetan mastiff with ghostly wolves in the background
The Extinct Species Within
Christie Wilcox | Aug 6, 2021
The genomes of living animals are littered with DNA from long-gone relatives, providing a lens on evolution, past extinctions, and perhaps even solutions to agricultural problems.
WITH VIDEO
One chimpanzee has its hand on the ear of another, as it peers onto the back of its neck. A third chimpanzee is in the background.
Chimp Groups Have Their Own Distinct “Handshakes”
Robin Donovan | Jun 18, 2021
A 12-year study shows variation among primate groups in how the animals clasp hands during grooming, but consistency within them, even as group membership shifts over time.
New Bacterium Linked to Chimp Deaths
Asher Jones | Feb 3, 2021
The newly discovered microbe seems to be responsible for a mysterious neurological disease that has killed dozens of critically endangered Western chimpanzees.
Image of the Day: Brains and Braincases
Emily Makowski | Oct 18, 2019
The skull changed shape in different ways than the brain during evolution, according to a new comparative study.
chimpanzee testes
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
Katarina Zimmer | Apr 16, 2019
For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.
Human Presence Influences Chimps’ Hunting Habits
Diana Kwon | Jun 26, 2017
Researchers find differences in predatory behavior between a long-observed chimp tribe and a recently habituated one. 
Companionship May Help Chimps Chill Out
Joshua A. Krisch | Nov 2, 2016
Study suggests chimpanzees get by with a little help from their primate pals.
Project Seeks to Improve Image of Animal Research
Kerry Grens | Sep 11, 2016
A new initiative in Germany aims to increase the public’s comfort with animal-based science; US government holds workshop on nonhuman primate research.
Decoding Human Accelerated Regions
Katherine S. Pollard | Aug 1, 2016
Do the portions of our genomes that set us apart from other animals hold the secret to human evolution?
Contributors
The Scientist Staff | Aug 1, 2016
Meet some of the people featured in the August 2016 issue of The Scientist.
Nailing Down HAR Function
Katherine S. Pollard | Jul 31, 2016
A remaining challenge in the study of human accelerated regions (HARs) is establishing their specific functions during development and other biological processes.
Understanding Human Accelerated Regions
Katherine S. Pollard | Jul 31, 2016
Fast-evolving regions of the human genome differentiate our species from all other mammals.
Research Chimps Being Retired
Tanya Lewis | May 6, 2016
A Louisiana research center is sending more than 200 chimpanzees to a sanctuary in Georgia.
Chimps Share Microbes When Socializing
Kate Yandell | Jan 15, 2016
Social interaction influences the chimpanzee microbiome, increasing the number of microbial species the primates share.
Embattled Chimps Relocate
Kerry Grens | Jan 9, 2016
After losing out on “personhood” in a legal battle, two chimpanzees that were held at a university in New York return to a research center in Louisiana.
Retirement for All NIH Chimps
Kerry Grens | Nov 19, 2015
The remaining 50 animals from a waning research program at the National Institutes of Health will head to sanctuaries.