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The Falcons are very effective, but its getting a pair to settle in is the problem. The squeal that Falcons emit works as well. Again not easy to acquire.
My experience (of 17 years) has me concluding that fake snakes, owls or hawks only work for a few days. Where upon the flying rats will use fake predators as perches.
The "bird scare call" which the birds interpret as; predator approaching or predator has got me. Is the most effective method and long lasting.
If you can find a dead one. Hang it in the tree. It works for many bird species. I don't know which ones it doesn't. Its effective on Crows. Even a collection of Crow feathers hanging in a tree works on them.
Don't waste your time on fakes. I spent a lot of time learning how to get rid of pest birds. Both native and exotic. The objective was to not harm the natives.
Once you get the recording of the flee call its all you need. Play it and the result is explosive. Often a different species will suffice. It does not need to be the same.
You can trap birds like Starlings, pigeons are useless. Not many other birds have the calls you want, apart from the natives.
I have rescued several fledglings from drowning in the pool. Birds of all species attack me in response to the stress call from the young bird that believes its about to be dinner. Young Noisy Minor screeching in my soft grip, a Magpie Lark (Pee Wee) hits me on the head with its feet. Dozens of birds of several species joined in the meelee.
They try but their efforts are laughable.
So that is how effective it can be, using the bird calls. On an alternate note; I have never tried but I wonder if there is anything downloadable on the net.
Cheers
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