Because it is:
"... Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost..."
"... Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost..."
At the link, NASA explains that those are not trees, and, these https://www.nasa.gov/image-feature/jpl/pia21271/fans-on-crater-rims are not herds of buffalo. They both sure look like it to me. :-)
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