I found out my two previous geese were ganders when breeding season started.
To begin with, there was just some synchronized swimming in the pool. The both grabbed on to the other one's neck and tried to mount, which resulted in them just going round and round. A little fighting, a little honking, but nothing violent.
Then one of them fell in love with his own mirror image in my windows. He'd spend all day by the windows, wooing his beautiful "spouse". Whenever the other gander got within a 10 foot radius, all hell broke loose. The other gander would be charged and chased far, far away, preferably out of the yard. Lots of screaming and large feathers flying. I covered up all the windows, so he couldn't see his image. That immediately took care of the problem, and the two ganders could again enjoy each other's company in peaceful bliss.
Just to show that even imaginary females can be a problem.
