So a few animals retain primitive systems with the sole purpose of measuring ambient light—of which the most unusual is the leatherback sea turtle, one of the world’s largest reptiles.

The leatherback sea turtle, the largest of all living turtles, is a remarkable marine animal whose long, slow-motion journey across the world’s oceans captivates scientists and nature enthusiasts ...

Here’s our preview of what’s leaving Netflix UK in May 2025.