I've never posted this anywhere before because frankly it sounds insane, but I'm finally ready to talk about it. This happened in March 2019 at my family's farm near Aviemore in the Scottish Highlands. I was twenty-five, home from university for Easter, alone in the house while my parents were at a farming conference.
Timeline: Around 10 PM, I was in the kitchen making tea when I heard something moving around the perimeter of the house. Not a wind sound - something solid and heavy. I could hear it dragging against the stone walls. The temperature in the kitchen dropped noticeably. I remember my breath suddenly became visible.
I locked all the doors (which were already locked, I checked). Whatever it was, it spent roughly twenty minutes trying the kitchen window - actually trying the latch, rattling it repeatedly. The window was on the second floor, which seemed important then and seems important now.
What I heard: Heavy breathing. Occasionally a sound like something between a growl and a human grunt. No clear vocalizations beyond that. The thing that got me most was the deliberateness - this wasn't an animal acting on instinct, it was systematically checking entry points.
I called the police around 10:40 PM. They arrived and found nothing - no tracks in the snow, no evidence of anything. They suggested a deer or sheep, which I knew was rubbish. I know what deer sound like.
I've never experienced anything like it before or since. Haven't told most people because of how it sounds.