Chimpanzee "Ham" during preflight activity with one of his handlers prior to the Mercury-Redstone 2 (MR-2) test flight which… https://www.rawpixel.com/image/441664/free-photo-image-laboratory-astronaut-chimpFree Image from public domain licenseCurious gorilla sitting alone smiles. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3305423/free-photo-image-smile-monkey-animal-faceFree Image from public domain licenseChimpanzee at the North Carolina Zoological Park in Asheboro, North Carolina. Original image from Carol M. Highsmith’s… https://www.rawpixel.com/image/422096/free-photo-image-monkey-public-domain-chimpFree Image from public domain licenseA black and white shot of a chimpanzee holding its child in the Mahale Mountain National Park. Original public domain image… https://www.rawpixel.com/image/3305588/free-photo-image-monkey-animal-animals-images-picturesFree Image from public domain licenseA monkey in a cave screaming with mouth wide open. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3287353/free-photo-image-animal-animals-images-pictures-baboonFree Image from public domain license