The booming popularity of acorn-based products is putting the squirrel population in South Korea at risk as human foragers steal the rodent's staple diet.
In the Republic of Korea, where human foraging is said to be at an all-time high, there are fewer acorns on the ground and as a result fewer squirrels.
Coming in to save the day for the hungry squirrels are 'Acorn Rangers'.
The team of dedicated animal saviours are policing university campuses and public parks across the Asian nation and scaring off acorn-foraging humans.
The volunteers have no legal authority to punish those they find, but hope to at least deter human foragers from returning.
They spend an hour each week, warning humans away and hiding acorns under tree leaves in an effort to help out the hungry rodents.
In South Korea food which is made from acorns, including noodles, jelly and powder, has grown in popularity after it was declared a healthy superfood that had the potential to fight obesity and diabetes.