I swear this is true.
Pam, my SO, came home from the grocery store and we decided to sit on the foredeck and enjoy a beer and sunshine and we noticed a Canada Goose fight near the boat. Apparently, two males are fighting over a female. One large male is definitely kicking the smaller one's butt and the smaller one is trying desperately to get away, but the larger one is all over him. Suddenly, the small one dives underwater, just like a Merganser! Completely, totally underwater, and he's gone. The large one is flapping his wings and squawking his head off as the smaller one pops back up. The large one is right on him and the small one dives again! This time, he gives the large goose the slip and pops up by shore where he scampers up into the rocks to hide. The large goose paddles off towards the city marina, looking for the small goose. Meanwhile, the female decides to head over to shore and is right up close to the small goose. The small goose has his opportunity now that the large goose is not nearby, but after the whooping he took, decided to stay in the rocks.
I ran inside and got my camera, hoping for a repeat ass whooping diving performance, but it didn't happen. You can see the female standing on a rock in the middle of the photo, and if you look carefully to the right and up a little, you can see the little male peeking up from his hiding place.
I told Pam that no one is going to believe that we saw a plump, feathery Canada Goose dive underwater, but I swear, we did. Really.
From Drift Away's blog.