https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14020842
A large mule carrying a load with a dog on top is walking on a rocky path with a town in the background. Etching by J. E. Ridinger.
A large mule carrying a load with a dog on top is walking on a rocky path with a town in the background. Etching by J. E. Ridinger.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use