Dust devils can grow huge on Mars — judging by its shadow, this one was 800 meters tall, about half a mile, and some have reached 10 times that height.

They’re constantly scrawling striking artwork on the Martian surface (below), picking up red dust to reveal the darker sand beneath.

These creatures may be lonely (spooky animation here), but apparently they’re friendly — both the Spirit and Opportunity rovers have had their solar panels cleaned by encounters with wandering devils.