Some of the best sites for free animal clip art include Classroom Clip Art and Graphics Factory. Both sites offer a wide selection of animal images that range from humorous and cartoonish to serious and realistic.
Classroom Clip Art hosts an extensive collection of animal clip art divided into a variety of subcategories. Users can browse by specific animal, including dolphins, frogs, porcupines and koalas, or by more general category, such as mammals or reptiles.
Although not organized by specific category, Graphics Factory offers a searchable database of free animal clip art. The site puts a watermark on all of its images, but users can download the clip art files to remove the mark and increase the image resolution.