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https://hyena-project.com ► When driving around inside the Ngorongoro Crater (Tanzania), one may come across peculiar rocks with neat bare rings at their feet - as if tiny meteorites hit the Crater - and wonder about their origin. This video explains their peculiarity: the rocks serve as perfect belly-scratchers for zebras and other ungulates - which trample down the earth surrounding the rocks. It is actually quite frequent to see zebras queuing for a few seconds in heaven.
Check out our website for more stories about the wildlife in the Ngorongoro Crater: http://hyena-project.com