Female winter moth

6809.     I tried my best. We were out and about outside. This was on my pants which I had taken off before discovery. The orange part at the back pulsates. Goes up and down. I made a video. I just want to know what it is. I have NEVER seen such a thing before. It’s maybe 2 cm long. Though I’m unsure. Honestly it freaks me out. Saskatoon, Saskatchewan. Canada

Number 6809. This looks like a female winter moth, Operophtera brumata (Lepidoptera: Geometridae); their wings are vestigial, rendering them incapable of flight. Click here for more detailed information.