Little drones, easy for kids to fly, maybe 6" from propeller to propeller (4 engines) are like $25. They have stabilizers that make them easy to fly.. They have flashing blue/red LEDs that might help in low light conditions to fly it. The think you have to worry about is that the batteries are Lithium. When they are ready to die they give you NO warning (outside the controls get sluggish, you can't climb as easily, etc) and then when the batteries die they drop out of the sky. You would not want to be over the pond when that happens. But they would be great fun for geese on land.
Some of the cheap little ones also have a tiny water reservoir and shoot water out of the front. Kind of a novelty thing for fun with kids but it is an additional surprise coming out of this buzzing blinking thing coming straight at you.
The bigger drones ramp up in price and I don't have a lot of experience with them. But the bigger ones have a feature that when battery is getting low they automatically return to the base where you took off from to make sure they set down safely.
