In a fascinating multi-year study, Larren Cole documented a colony of beavers that keep the seventh-day Sabbath! In the process he encountered multiple stories of other individual animals as well as whole specie groups that keep Shabbat.
Should we be surprised? Consider,
..The heavens are telling of the glory of God;
And their expanse is declaring the work of His hands.
2 Day to day pours forth speech,
And night to night reveals knowledge.
3 There is no speech, nor are there words;
Their voice is not heard...
Here is a video interview,
And, where you can get the documentary : https://desiremedia.org/beavers/