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These look like “spiders”, but not quite.

 

Comments by Zooniverse volunteer rayperry on this image of the Martian surface from Planet Four: Terrains have sparked some really interesting discussions among the science team about the evolution of the features known as “spiders”. Check out the conversation hereĀ www.zooniverse.org/projects/mschwamb/planet-four-terrains/talk/subjects/1037800