Can a scarecrow crow scare crows?

We have a new resident at the allotment; his name is Colin the crow. Though with his big orange beak he's more like a blackbird, with green eyes. I'm hoping he'll scare off the birds and animals that spend a good deal of time devouring all my hard work. He's made from black bin liners stuffed with supermarket plastic bags. I read that movement and sound frighten the birds away, so Colin has 'feathers' that flap about in the wind. However, I have a feeling that every mammal and bird in the neighbourhood will be congregating on my plot to laugh at the new curiosity.