The Zoo penguins have paired up and taken possession of their nest rings.
They collect pebbles to line the nest, and pinch them from the next door if a neighbour is not looking. The penguin webcam shows frequent disagreements if the theft is detected, or if a male neighbour seems to show too much interest in a female.
DNA tests on chicks revealed a surprising number whose father was not the male of the pair. I heard that last year "Snowflake", who has a lighter, pale brown back and is very recognisable, was running no less than eight ladies on separate nests. This year he has been unenthusiastic about pairing up at all - lack of energy?