In my grandmother鈥檚 house a snail-trail-like substance is visible on the mat in the conservatory each morning. There are no apparent signs of a snail living in the room and the door is locked at night. Is there another insect or animal that causes this effect?
Shane Duffy (age 12), Dublin, Ireland
This article appeared in print under the headline 鈥淭rail of mystery鈥�
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