|I love you, Earth! (photo)|
|Mama, these gourds are so big! (photo)|
Now, as to whether any of these clever ideas actually works is not information to which I am privy. Watching "Dumbo" has taught me that scarecrows are just another perch for crows to rest.
The oldest known account of a scarecrow from 1300 years ago is actually from Japan (source). My guess is that you don't use something for 1300 years without it working, right?
Here is a peculiar video of a Japanese farmer in Shizuoka who has definitely thought outside of the box to keep his family garden untouched.
Thanks to Softypapa for the upload! Check out his many other travelogue-ish accounts of Japan.