
Movement and Migration data of animals.
Movebank API is a free Animals API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Description of download interface to build calls to the Movebank database using HTTP/CSV or JSON/JavaScript requests
Details from github.com.

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The Movebank API is provided by movebank (github.com). Description of download interface to build calls to the Movebank database using HTTP/CSV or JSON/JavaScript requests
Yes. The Movebank 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 Movebank API requires no authentication, so you can start making requests without signing up.
Yes. The Movebank API supports CORS, so front-end JavaScript can call it directly.
Yes. The Movebank API is served over HTTPS, so it's safe to use in production.