Ten years after the original series, BBC's widely-acclaimed Planet Earth returns to television in the UK in November and in the US in January 2017.
The first episode, Islands, looks at how animals can become very large or very small in those conditions. This adorable swimming sloth looks worth watching the series all the way through:
Bonus video: extended trailer:
https://www.youtube.com/watch?v=c8aFcHFu8QM
