Brown bulldog face on white background. Free public domain CC0 photo. https://www.rawpixel.com/image/6040581/photo-image-background-face-public-domainFree Image from public domain licenseA female leopard is illuminated by a red spotting lamp during a night-time game drive in Naboisho Conservancy bordering the… https://www.rawpixel.com/image/8811884/photo-image-background-public-domain-blackFree Image from public domain licenseBlack dog with collar on white background. Free public domain CC0 photo. https://www.rawpixel.com/image/6022027/photo-image-background-public-domain-blackFree Image from public domain licenseA postcard wishing good luck illustrated by various lucky charms. Chromolithograph. https://www.rawpixel.com/image/13969005/image-horses-cartoon-plantFree Image from public domain licenseMustering Shepherds in the high country use teams of dogs to help them muster stock off the hills for shearingand weaning.… https://www.rawpixel.com/image/4021287/photo-image-green-nature-dogFree Image from public domain licenseRuby-throated hummingbird. A female ruby-throated hummingbird visits a hummingbird feeder. Original public domain image from… https://www.rawpixel.com/image/4025479/photo-image-green-bird-natureFree Image from public domain licenseEastern Gray Treefrog at Horicon National Wildlife RefugePhoto by Rachel Samerdyke/USFWS. Original public domain image from… https://www.rawpixel.com/image/4029087/photo-image-plant-leaf-birdFree Image from public domain licenseMonarch caterpillar on common milkweedPhoto by Jim Hudgins/USFWS. Original public domain image from Flickr https://www.rawpixel.com/image/4028627/photo-image-plant-green-summerFree Image from public domain licenseMonarch butterfly on branch, blue background. Original public domain image from Flickr https://www.rawpixel.com/image/4029077/photo-image-woods-butterfly-forestFree Image from public domain licenseGreen FrogWe spotted this green frog at the edge of a muddy puddle in northern Minnesota.Photo by Courtney Celley/USFWS.… https://www.rawpixel.com/image/4028611/photo-image-summer-nature-waterFree Image from public domain licenseLocupletissimi rerum naturalium thesauri accurata descriptio, et iconibus artificiosissimis expressio, per universam… https://www.rawpixel.com/image/9975529/image-art-vintage-animalFree Image from public domain licenseBritish, Labourers (1781) painting in high resolution by George Stubbs. Original from The Yale University Art Gallery.… https://www.rawpixel.com/image/3819812/illustration-image-art-peopleFree Image from public domain licenseDragonfly's face closeup, insect background. Free public domain CC0 photo. https://www.rawpixel.com/image/6038365/photo-image-background-face-public-domainFree Image from public domain licenseSoft Shelled Turtle, NPS Photo, Kevin Bowles Mohr. Original public domain image from Flickr https://www.rawpixel.com/image/4033988/photo-image-animal-public-domainFree Image from public domain licenseAmerican ToadPhoto by Courtney Celley/USFWS. Original public domain image from Flickr https://www.rawpixel.com/image/4028385/photo-image-nature-animalFree Image from public domain licenseKootznoowoo Wilderness, Admiralty Island, Tongass National Forest, Alaska. (Forest Service photo by Don MacDougall).… https://www.rawpixel.com/image/3391143/free-photo-image-alaska-animal-bearFree Image from public domain licenseBull Elk is standing in the field at Rocky Mountain National Park. NPS Photo/M.Reed. Original public domain image from Flickr https://www.rawpixel.com/image/4225014/photo-image-public-domain-nature-animalFree Image from public domain license