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Do Chimps Who Pee Together Stay Together?

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Do Chimps Who Pee Together Stay Together?

Ena Onishi, a doctoral student at Kyoto University, has spent over 600 hours watching chimpanzees urinating. She has a good reason for all that peeping, though. She is part of a team of researchers that recently discovered that the primates tend to tinkle when they see nearby chimps do the same.

In a study published Monday in the journal Current Biology, Ms. Onishi and her colleagues described this phenomenon, which they call contagious urination. Their discovery raises questions about the role peeing might play in the social lives of chimps and other primates.

Ms. Onishi first spotted contagious urination in 2019 while observing chimps at the Kumamoto Sanctuary in Kyoto, Japan. “I was observing a group of captive chimpanzees for a different research project, and I noticed that they tended to urinate at the same time,” Ms. Onishi said. “It got me thinking, Could this be one of those contagious behaviors like contagious yawning?” she explained, referring to our innate tendency to yawn upon seeing or hearing others do it.

To find out, Ms. Onishi studied the sanctuary’s 20 chimpanzees, observing them peeing together over 1,300 times. After crunching the numbers, Ms. Onishi and her colleagues realized that the chimps were indeed urinating in rapid succession. They found that the nearer a chimp was to the initial urinator, the more likely it was to join the party. They also discovered that chimps lower on the social ladder were more likely to go when others were going.

“This result was surprising for us,” Ms. Onishi said. “It raised intriguing questions about the social function of this behavior, which has been overlooked for a long time.”

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Why the chimps do this remains a mystery, but Ms. Onishi and her colleagues have several hypotheses. “Contagious urination might help reinforce group connections, boosting overall social cohesion,” she said. “It could promote a shared readiness for collective behaviors. There are so many possibilities.”

Although the study was limited to captive chimpanzees, many of them rescued from the biomedical research industry, the chances that this behavior is unique to this group are low.

“If you walk with great apes in the wild, you often see that group members really coordinate what they’re doing,” said Martin Surbeck, an evolutionary biologist at Harvard University who studies the behavioral ecology of chimps and bonobos and was not involved in the research.

Dr. Surbeck said that he wasn’t surprised to learn that the Kumamoto chimps were engaging in contagious urination and that the behavior wouldn’t be unexpected in the wild. “We might even see it in other social species,” he said.

While more research is needed on contagious urination and its evolutionary function, Ms. Onishi and her colleagues were delighted that they had learned so much through simple observation.

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“There is a myriad of things to be discovered from the daily activities of animals,” Ms. Onishi said.

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Video: Crowds Flood New York City Streets for First Day of Manhattanhenge

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Video: Crowds Flood New York City Streets for First Day of Manhattanhenge

new video loaded: Crowds Flood New York City Streets for First Day of Manhattanhenge

People filled the streets of New York on Thursday to get a glimpse of this year’s first Manhattanhenge. The spectacular view of the sun setting, flanked by the city’s streetscapes, will also occur on Friday and July 11 and 12.

By James McManagan

May 29, 2026

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Oxnard man smuggled baby crocodiles, among 1,700 reptiles, gets 5 years

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Oxnard man smuggled baby crocodiles, among 1,700 reptiles, gets 5 years

An Oxnard man has been sentenced to more than five years in prison for smuggling at least 1,700 reptiles worth more than $739,000 into the U.S. over six years, the U.S. Department of Justice announced Friday.

The animals, including baby crocodiles and Yucatán box turtles, were bought and sold over social media and came from Mexico, Hong Kong and elsewhere, an investigation led by the U.S. Fish and Wildlife Service revealed.

From January 2016 to February 2022, Perez and co-conspirators brought in wild animals without the permits required by the Convention on International Trade in Endangered Species of Wild Fauna and Flora — and without declaring them, the Justice Department said.

In August 2022, Jose Manuel Perez pleaded guilty in federal court to one count of smuggling goods into the country and one count of wildlife trafficking.

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The animals smuggled from Mexico were advertised on social media, with defendants posting photos and videos of the reptiles being captured in the wild.

People working with Perez would collect the reptiles including Mexican box turtles and Mexican beaded lizards, at from an airport in Ciudad Juárez, then move them by car over the border to El Paso.

According to federal authorities, Perez paid people a “crossing fee” each time they traversed the border. Payment depended on how many animals they trafficked, the size of the package and the level of risk they faced.

Sometimes Perez and another person would traveled to Mexico to buy animals taken from the wild to smuggle into the U.S. Once shipped, they were transported to Perez’s home, in Missouri and then California after he moved there.

When the sentence came down, Perez was already serving nine years for felony possession of firearms. Due to convictions in Ventura County Superior Court for “street terrorism” and assault with a deadly weapon, he is not allowed to have firearms, the department said.

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According to the San Diego Zoo Wildlife Alliance, illegal wildlife trafficking is the second-largest threat to species after habitat loss and the world’s fourth-most-lucrative trafficking industry.

“Illegal wildlife trafficking not only diminishes the populations of targeted wildlife species, it also impacts related species, their interconnected ecosystem, local and global economies, and has the potential to impact the health of people through zoonotic disease transmission,” the alliance says on its website.

Reptiles get caught in the fray. Earlier this month, the Justice Department announced that a Daly City man suspected of purchasing and exporting hundreds of poached turtles from Florida was facing federal wildlife trafficking charges.

The U.S. attorney’s office for the Southern District of California and a section of the Justice Department’s Environment and Natural Resources Division, along with U.S. Customs and Border Protection and Homeland Security Investigations, assisted federal wildlife officials with the investigation into Perez’s dealings. The case was prosecuted in U.S. District Court for the Central District of California.

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Video: Blue Origin Rocket Explodes on Florida Launchpad

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Video: Blue Origin Rocket Explodes on Florida Launchpad

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Blue Origin Rocket Explodes on Florida Launchpad

A rocket built by the Jeff Bezos-owned space company, Blue Origin, blew up during a test at the Cape Canaveral Space Force Station in Florida.

“Oh, no, that’s an explosion.” (explosion erupts) “That is crazy.” “What?” “Oh, my God!”

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A rocket built by the Jeff Bezos-owned space company, Blue Origin, blew up during a test at the Cape Canaveral Space Force Station in Florida.

By Nailah Morgan

May 29, 2026

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