My parents have a pond with about 300 geese that hang around and poo everywhere. When bird flu finally arrives here, it's spread in the poo of infected animals and can live in the poo for over a month during cold times. We called the state to find out what we're allowed to do to get rid of the geese. There's a goose season in the fall that they're talking about extending this year to cut down on the numbers, but the fall will be long after bird flu gets here.
They have 4 non-lethal things they allow:
1) Floating fake alligator heads. Geese are afraid of alligators.
2) Floating fake dead geese. Sort of like a reverse decoy.
3) Several companies make non-lethal repellent you sprinkle on the grass.
4) A sonic alarm that plays the sound of scared and agitated geese.
But you can't shoot 'em. At least not in Maryland.
Except during goose season ... which is 'way too short, and the bag limits are 'way too low (One per day?!?!?!).
-Bustard, who eats dead gooses
Pie eater--Do your parents live in the city, or in the country? I live in Maryland, and am very efficient at culling geese. If they live where it's legal to shoot, I'd be happy to remove their geese. (Go here for photo showing results:
http://www.bucksnducks.net/photos/Geese%2002.jpg )