O'Reilly-published books often have an animal on the cover. I don't think they are picked for relevance to the topic (even most of the Python books don't have pythons!)
https://www.oreilly.com/content/a-short-history-of-the-oreil...
https://www.oreilly.com/content/a-short-history-of-the-oreil...
Well, that actually makes sense since Python derives its name from Monty Python and not the reptile.