1. National Geographic Kids: The National Geographic Kids website frequently features articles and quizzes about animals and nature. Many high-quality images and photos accompany these articles.
2. San Diego Zoo Kids: The San Diego Zoo Kids website offers interactive educational activities, including virtual zoo tours, animal facts, and coloring pages. Their pictures usually focus on animals from the zoo's collection.
3. DK Find Out: DK Find Out is a website specializing in educational content for kids. Animal pictures are found in numerous articles and interactive resources, such as quizzes and puzzles.
4. WWF for Kids: The World Wildlife Federation's website dedicated to kids provides information about endangered animals and conservation efforts. Their gallery showcases impressive images of animals.
5. Animal Fact Guide: This website collects interesting facts about various animals, along with high-quality pictures.
6. iStockphoto: iStockphoto offers a vast library of stock images, including many animal pictures. Kids-friendly images can be found by using relevant keywords. Note that this is a commercial website, so using images may require licensing.
7. Openclipart: Openclipart is a free resource filled with public domain vector illustrations, including numerous cartoonish animal images.
8. Pixabay: Pixabay offers a wide selection of free images, and many of them feature animals.
9. Google Images: Using Google Images can yield relevant animal pictures. Apply filters like "Creative Commons Licenses" or "Usage Rights" to find non-copyrighted images.
Remember to review the terms of use and licensing requirements of each website before downloading or using the pictures.