Well, in this case it's why did mummy and daddy swan and their cygnets cross the road using the Zebra crossing?
I've observed pigeons in London cross over using the pelican crossing but I've never heard of swans obeying the traffic code. Has the world gone stark raving bonkers? See Swan family obey Green Cross Code
Note the magic number EIGHT again in action.
Related articles: More About My Romance with the Number 8; Homing Pigeons