By Dean Murray

Geologists at Yellowstone National Park have pulled more than 300 lost hats from the famous hot springs.

The headwear, estimated to be worth over $6,000, is among a range of items collected so far this year, including a Birkenstock sandal, a stuffed koala toy, and a pizza box with slices still inside.

A team from the Yellowstone National Park Geology Program is tasked with removing items from the park's sensitive thermal areas.

So far in 2025, the crew has collected more than 13,000 pieces of trash and 4,000 rocks and sticks from hydrothermal areas.

The U.S. Geological Survey (USGS) said: "To reach this debris, which is often literally floating in boiling water, the Geology team uses a collection of tools: some off-the-shelf and others manufactured in-house using

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