People take part in a Halloween street party at Lan Kwai Fong on October 31, 2016 in Hong Kong. Halloween, a contraction of All Hallows' Evening, falls on the day before All Saints' Day on November 1, a holiday when Christians remember their deceased loved ones. (Photo by Lam Yik Fei/Getty Images)

It would seem to be something you'd see only in a cartoon or at a Phish concert, but according to park rangers in New South Wales, Australia, dozens of giant, fluorescent pink slugs have been popping up on a mountaintop there. The eight-inch creatures have been spotted only on Mount Kaputar, a 5,000-foot peak in the Nandewar Range in northern New South Wales. Scientists believe the eye-catching organisms are survivors from an era when Australia was home to rainforests. A series of volcanoes, millions of years of erosion and other geological changes “have carved a dramatic landscape at Mount Kaputar”, the park service wrote on its Facebook page, and unique arid conditions spared the slugs from extinction. (Photo by Michael Murphy/AFP Photo/NSW Environment Office)

A light installation is seen on the facade on the banks of the Saone river to pay tribute to the victims of the Paris attacks in Lyon, France, December 8, 2015. (Photo by Robert Pratta/Reuters)

A man takes a photo as a puff of smoke comes from Mount Agung volcano, taken from the Rendang sub-district in Karangasem Regency on Indonesia's resort island of Bali on November 23, 2017. Thousands living in the shadow of the rumbling volcano on Indonesia's resort island of Bali fled on November 22 as fears grow that it could erupt for the first time in more than 50 years. (Photo by Sonny Tumbelaka/AFP Photo)

People dressed in traditional costumes sing Christmas carols as they gather to celebrate Orthodox Christmas at a compound of the National Architecture museum in Kyiv, Ukraine on January 7, 2022. (Photo by Valentyn Ogirenko/Reuters)

Sеx worker Geraldine wearing cat make-up sits on her usual corner as she waits for clients outside the Revolution subway station, in Mexico City, Saturday, March 13, 2021. Geraldine, 30, a sеx worker since age 15, says many of her regular clients have stopped coming amid the coronavirus pandemic and that seeing new clients presents new health and security risks. She is most concerned about the risk of bringing COVID-19 home to her partner, who has diabetes. (Photo by Rebecca Blackwell/AP Photo)

American media personality and socialite Kim Kardashian poses at GQ's Men of the Year Party at Bar Marmont, Thursday, November 16, 2023, in Los Angeles. (Photo by Chris Pizzello/AP Photo)

Groundhog Club handler A.J. Dereume holds Punxsutawney Phil, the weather prognosticating groundhog, during the 138th celebration of Groundhog Day on Gobbler's Knob in Punxsutawney, Pa., Friday, February 2, 2024. Phil's handlers said that the groundhog has forecast an early spring. (Photo by Barry Reeger/AP Photo)