Zachary Hajian-Forooshani never expected to find snails in the mountainous, coffee-producing heart of Puerto Rico. In 2016, when he was a University of Michigan masters student, he and his peers noticed some curious excrement on the undersides of coffee plants, which they eventually traced to the invasive Asian tramp snail. “Cool things pop out and you follow up with them,” says Hajian-Forooshani, who has made the snails and their colorful poop the subject of his doctoral research. “I just followed a trail of excrement.”
The oddly colored snail poop was, not coincidentally, the same bright-orange color as coffee rust, a parasitic fungus that’s coming for your morning buzz.