split image of oldest mouse ever

A mouse named Patrick Stewart (in tribute to the iconic actor), has been verified as the oldest living mouse in human care as well as the oldest mouse ever, aged 9 years 210 days as of 9 February 2023.

Pat’s age is unprecedented for a mouse. He’s almost two years older than the previous oldest mouse ever recorded, Fritzy (1977-1985), who was owned by Bridget Beard (UK) and lived to the age of 7 years 225 days.

Pat is a Pacific pocket mouse, which is North America’s smallest mouse species and was thought to be extinct until a small population was rediscovered in 1993.

The record-breaking rodent was born on 14 July 2013 in the Pacific Pocket Mouse Breeding Facility at San Diego Zoo Safari Park, where he has lived his entire life. 

@guinnessworldrecords Oldest mouse ever 🐁 9 years 210 days - Patrick Stewart from @sandiegozoo 🇺🇸 #mouse#mice#pets#rodent#guinnessworldrecords#sandiego♬ original sound - Guinness World Records

Pat’s birth date has been confirmed via multiple medical records and animal record logs. 

He was produced by two wild-caught parents and was born with one other male littermate, during the first year of the zoo’s Pacific pocket mouse conservation, breeding and reintroduction program.

Although Pat has never sired a litter himself, “he still tries,” according to Dr Debra Shier, who monitors Pat at the breeding facility.

“He has been paired 32 times with 23 different females and while he exhibited good courtship behavior (sandbathing, slow approach and digging), females were extremely aggressive in mate pairings with him,” Dr Shier explained.

“He came closest to mating in his pairing this year as a nine-year-old male and may have mated if the trial wasn’t stopped due to a time limit of two and a half hours.”


The average lifespan of a Pacific pocket mouse in the wild is one to two years; in captivity it can increase to four to six years.

Weighing about the same as three pennies, the endangered rodent gets its name from the pouches in its cheeks which are used to carry food and nesting materials.

Though small, these mice play a crucial role in their ecosystems by dispersing the seeds of native plants and encouraging plant growth through their digging activities.

According to the San Diego Zoo Wildlife Alliance, receiving this Guinness World Records title is a win for the small, often-overlooked species.

“This recognition is so special for our team, and is significant for the species. It’s indicative of the dedication and incredible care we as an organization provide for each species, from the largest to the very smallest. This acknowledgement is also a symbol of appreciation for species that people don’t know much about because they’re not charismatic megafauna, but are just as critical for ecosystem function. These overlooked species can often be found in our own backyards—like the Pacific pocket mouse”- Debra Shier, Ph.D., Brown Endowed Associate Director of Recovery Ecology at San Diego Zoo Wildlife Alliance.


For 20 years, the Pacific pocket mouse was thought to be extinct until a tiny remnant population was rediscovered in 1994 at Dana Point, California.

Endemic to coastal scrublands, dunes, and riverbanks within about two miles of the ocean, the Pacific pocket mouse’s range once stretched from Los Angeles to the Tijuana River Valley.

However, because of human encroachment and habitat degradation, their numbers dropped sharply after 1932.

This drastic population decline prompted the establishment of San Diego Zoo Wildlife Alliance’s conservation, breeding and reintroduction program in 2012, in order to help save the species from extinction.


Pacific pocket mice have thrived under human care, and some have been successfully reintegrated into the wild.

In 2017, the San Diego Zoo Wildlife Alliance, the U.S. Fish and Wildlife Service, and the California Department of Fish and Wildlife established a new population of Pacific pocket mice in Orange County’s Laguna Coast Wilderness Park, where they began to breed without human assistance.

2022 was a historic breeding season for the program’s mice; a record 31 litters were produced, with 117 pups in total. These mice will also be introduced into the wild.

Such efforts to augment population numbers are critical for the conservation of this tiny but mighty species.

Congratulations to Pat and the San Diego Zoo Wildlife Alliance. You are now Officially Amazing!


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