Amazing jumping spider went across the patio today. He had a red back! Black all over but with a furry, red bum. I tried to get a photo, but jumping spiders are impossible. Their huge eyes track every movement and they constantly wheel in a defensive pivot. You just can't get too close. There is also that deep-seated fear of it lunging into the air and clamping on my face. There is that.
Okay. I looked him up and it is a Boreal jumping spider.