Hello.
Is it true that when Geese have their young, they don't tolerate Herons and Cormorants.
A+
Mating pairs will also fight off multiple geese if needed. I've had them pen 15-20 in a corner, and harass them nonstop from sundown to sunlight.
They'll harass Cormorants if they land, but that's rare. Here at least, cormorants avoid geese.
