https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13990525
Above, an otter drinking from a stream with a waterfall in the background, below, the otter's tracks. Etching by J. E. Ridinger.
Above, an otter drinking from a stream with a waterfall in the background, below, the otter's tracks. Etching by J. E. Ridinger.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use