Reddit reviews Animals: 1,419 Copyright-Free Illustrations of Mammals, Birds, Fish, Insects, etc (Dover Pictorial Archive)
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Dover Publications
オライリーの表紙の動物は、ドーバーの"Animals: 1,419 Copyright-Free Illustrations of Mammals, Birds, Fish, Insects, etc"という本から主に採られているらしい。
Fun fact: That octopus is featured in a book with 1400+ copyright free animal drawings. The octopus specifically was used in the Sing the Sorrow album artwork by AFI
I just did a painting of some salmon, and it took days of combing through Google results to find what I wanted, slow but it works. I also have this book which can be helpful. Any way you do it though, if you have something really specific it's hard to find good reference.
Edit I see you said photos, sorry that book probably won't help