Every now and again I see a TV programme that touches my heart and this one was amazing. In the Antarctica at a certain time of the year these Emperor Penguins come out of the sea and trek, mostly upright, 70 miles to the same place every year to find a mate.
Once the egg is produced it is transferred from the female to the male who keeps it warm and safe until it hatches. Meanwhile the female treks back to the sea for food. This is winter, bitterly cold and forever dark. The males huddle together for warmth until the females return with food.
Then roles are reversed again, the male going back to the sea for food while the female looks after the young penguin until they are ready to go out to sea.
Don't they look amazing?