The footprints were left in the mud by two different species “within a matter of hours, or at most days,” said palaeontologist Louise Leakey, co-author of the research published Thursday in the journal Science.

The footprints were left in the mud by two different species “within a matter of hours, or at most days,” said palaeontologist Louise Leakey, co-author of the research published Thursday in the journal Science.
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