But what about Earth - when did animals first leave footprints here?
The fossilised footprints were discovered by a team of scientists studying trackways and burrows in China.
An global team of scientists, including researchers from the Nanjing Institute of Geology and Palaeontology, and Virginia Tech in the United States, conducted the study. This is considered the earliest animal fossil footprint record.
The rock layers where the fossils were found date between 551 million and 541 million years ago, suggesting the footprints were made some time between those dates.
This places them perhaps even 10 million years before the "Cambrian Explosion" (roughly 541 million years ago), the moment in time which sparked the incredible evolution of life that led to the awesome diversity of species that we see today.
"These trace fossils represent the earliest known trackways". That's hundreds of millions of years before dinosaurs started roaming Earth, about 245 million years ago.
The scientists are unsure whether the creature had many legs or just two, and whether it was a member of the arthropod group, which includes bumblebees and spiders, or annelids, which contains modern-day bristle worms. The new findings suggest animals evolved primitive "arms" and "legs" earlier than previously thought. In fact, the China discovery represents one of the earliest known records of animals evolving appendages.
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She had also worked for the social development ministry in Buenos Aires province and at a United Nations office in Panama. Her father Jorge Zorreguieta, Argentina's former agriculture minister, died a year ago .
Previously no evidence of limbed animals has been found that pre-dates the "Cambrian Explosion", the sudden surge in diversity that occurred on Earth about 510 to 541 million years ago.
Professor Shuhai Xiao, a geobiologist at Virginia Tech University, told The Guardian: "Animals use their appendages to move around, to build their homes, to fight, to feed, and sometimes to help mate". "It is important to know when the first appendages appeared, and in what animals, because this can tell us when and how animals began to change to the Earth in a particular way".
The trackways' characteristics indicate that a bilaterian animal - that is, a creature with bilateral symmetry that has a head at one end, a back end at the other, and a symmetrical right and left side - made the tracks.
The 550-million-year-old tracks measure only a few millimetres in width, and consist of two rows of imprints arranged in what the researchers describe as a "poorly organised series or repeated groups", which could be due to variations in gait, pace, or interactions with the surface of what was once an ancient riverbed.
The animal appears to have paused from time to time, since the tracks appear to be connected to burrows that may have been dug into the sediment, "perhaps to mine oxygen and food", the report said.
Priced at $120-it's $90 right now for Prime members-the Fire TV Cube is now the most expensive Fire TV product. This means you can ask Alexa to find sci-fi movies, play movie trailers or show more results.
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