Random pictures of foxes.
RandomFox API is a free Animals API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.

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Random pictures of Shiba Inu, cats or birds
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Yes. The RandomFox API is listed in the Animals category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The RandomFox API requires no authentication, so you can start making requests without signing up.
Not directly. The RandomFox API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The RandomFox API is served over HTTPS, so it's safe to use in production.