On review pattern and colour of head supports hybrid
sighting relates to the top bird in this image
This male mallard x muscovy duck mated with a female Egyptian goose. I doubt there will be any viable offspring but if there is those would be insane hybrids.
Short video of this rare hybrid can be seen here: https://www.youtube.com/shorts/cpBGNALFHQs
It showed up at our feeding station for a few weeks and mostly associated with Egyptian Geese, but also would follow with Muscovies as well on occasion. He had a real identity crisis!
This hybrid doesn't seem to exist on inat. The female is pure Pateke, but the male has several mallard traits such as a grey tail, and a particularly green head.