I'd go no. Looks to be natural and picked due to its bovine characteristics. 12 years and hundreds if not thousands of stones on from my previous post on the topic.
It's a lizard, like Mr Icke said.
http://www.dailymail.co.uk/sciencetech/article-3982790/UFO-hunter-claims-spotted-lizard-Mars-images-Nasa-s-Curiosity-rover.html
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