Lots of big knobs at Orient Station these days. Magpie Goose (Anseranas semipalmata) males are all big heads.
Maybe the conk on top comes from having a bird family all their own. Makes them feel special. That, and the hooked bill, and part-webbed feet.
Plenty of healthy green feed, lots of company (800 on these reeds yesterday), and any number of females without big heads.
Could life be any better?