While this tourist may have been well-intentioned, stepping onto any of Yellowstone’s bacterial mats is\u00a0considered thermal trespass<\/a>\u00a0and is punishable with anything from fines to a temporary ban from the park. Hat and object retrieval is best left to the professionals.<\/p>\n Thermal Trails<\/strong><\/p>\n Yellowstone\u2019s bacterial mats are alive.<\/p>\n The dynamic, colorful landscapes consist of layer upon layer of thermophiles, microscopic photosynthetic organisms that thrive in the intense heat of the park\u2019s thermal basins.<\/p>\n Whether by sudden wind gust or willful mischief, items will occasionally end up on these bacterial mats.\u00a0<\/p>\n Jeff\u00a0Henry, lifelong Yellowstone employee, enthusiast and author, has retrieved plenty of odd items from these places.<\/p>\n \u201cI found a tire that looked like it came off a car in the 1920s, with a large diameter and thin width,\u201d he told Cowboy State Daily. \u201cOne time, I found a 1913 penny at the edge of Morning Glory Pool. And then lots of things you would expect, like jars, water bottles and lots of baseball caps.\u201d<\/p>\n Stepping on Yellowstone\u2019s bacterial mats is illegal, but\u00a0someone\u00a0must retrieve these discarded objects. That\u2019s why it\u2019s left to the professionals.<\/p>\n Yellowstone wasn\u2019t available to comment on the protocols followed to retrieve discarded objects, but Henry remembered the methodology he followed when he had to. It\u2019s all about observation, planning and following natural \u201ctrails.\u201d<\/p>\n \u201cI use my eyes and head to get out there,\u201d he said. \u201cI tried to walk where bison had walked to minimize the chances of breaking through the thermal crust. And, usually, the runoff channels leave little ridges of accreted geyserite along their borders. If you walk on those, then you don’t damage the bacterial mats.\u201d<\/p>\n The average Yellowstone tourist might not recognize these pathways across the bacterial mats. Henry said most park employees tasked with retrieving these items know where to step and how to minimize their impact on the fragile landscape.<\/p>\n If an item is out of reach, Henry and others would occasionally\u00a0use\u00a0a pole or a grabber to reach and retrieve the object. However, Henry said such tools usually weren\u2019t needed.<\/p>\n \u201cIt wasn\u2019t that hard to do, if you used your eyes and thought about what you\u2019re doing,\u201d he said. \u201cIt’s been a long time since I’ve worked for the National Park Service, but (object retrieval) was more of a casual thing back then. If you saw a discarded piece of litter or somebody’s hat had blown off, you would go get it.\u201d<\/p>\n\n
![\"Other](\"https:\/\/www.europesays.com\/us\/wp-content\/uploads\/2025\/08\/Hats-Grand-Prismatic-526606637_24663389833245969_7163094911321346917_n80-7.31.25-7.31.25.jpg\")
Other Yellowstone visitors were horrified Monday as they watched a man in flip-flops walking off the board walk onto the bacterial mats around Grand Prismatic Spring. He was picking up hats that had blown off people\u2019s heads \u2014 and breaking the law. (Photos courtesy Yellowstone National Park: Invasion of the Idiots)<\/li>\n![\"Other](\"https:\/\/www.europesays.com\/us\/wp-content\/uploads\/2025\/08\/Hats-Grand-Prismatic-525900133_24663390249912594_95818301272477863_n31-7.31.25-7.31.25.jpg\")
Other Yellowstone visitors were horrified Monday as they watched a man in flip-flops walking off the board walk onto the bacterial mats around Grand Prismatic Spring. He was picking up hats that had blown off people\u2019s heads \u2014 and breaking the law. (Photos courtesy Yellowstone National Park: Invasion of the Idiots)<\/li>\n![\"Other](\"https:\/\/www.europesays.com\/us\/wp-content\/uploads\/2025\/08\/Hats-Grand-Prismatic-525208950_24663390446579241_9034512665520554345_n5-7.31.25-7.31.25.jpg\")
Other Yellowstone visitors were horrified Monday as they watched a man in flip-flops walking off the board walk onto the bacterial mats around Grand Prismatic Spring. He was picking up hats that had blown off people\u2019s heads \u2014 and breaking the law. (Photos courtesy Yellowstone National Park: Invasion of the Idiots)<\/li>\n<\/ul>\n