When I think of “guard geese” I really think more of “alert geese” & “deterrent geese”.
I’ve seen hawks swerve and fly away due to our geese size and the flock movement (I have 11 geese), which has def been a deterrent to some areal predators in our areas. Our chickens can and have used the larger gaggle as their personal cover in these instances. Works well for us in certain cases. Although we seem to not have an issue with the larger areal predators, either. I’ve experienced our geese being good alerters to strange animals and activities and larger birds swooping in. It does help, we have every kind of domestic farm type bird on our property and they feed off the different alerting. That really seems to help with predation in general.
Do geese “guard” in a traditional sense, no, generally not. I mean, some will attack strange creatures, absolutely. But it’s essentially sacrificing itself, likely will get severely hurt or possibly die, especially with canine type predators. The gooses attack can allow the rest of the flock to escape/hide (if there’s anywhere to hide) or a chance to get away at least, until/if help comes. There is value in that, potentially, but I love geese so this scenario is sad, still.
I always talk to our customers about how it really does depend on how your yard or farm layout is, is there other protection from predators or are you solely trying to just rely on one thing for protection? Do you have multi layered protection in place? Are there places to hide? Will your animals hide, do they even have good instincts? Mine do, some don’t for their own good, lol. It’s really a take everything into account scenario.
We have emu to protect from the ground standpoint (coyote, dog, raccoon, anything that doesn’t belong), they’ll stomp anything strange to death, just yesterday went after a poor egret that decided to land in our front pasture. Hell ours even chase squirrel away! Multi layered protections like this, on a property that is designed for success, can work well.
Anywho. That’s just my 2c
