Crows and ravens are inteligent creatures, it makes it harder to chase them away indefinetly.
[Pigeons are not the brightest birds around, they'll let you chase them away without much trouble. Crows will test your vigilance and take advantage of your weaknessess if you let them. If they'd figured out she was not a real threat they wouldn't let her chase them off.]
It might be that they managed to give one of them a good scare once upon a time, creeping up on the unnoticed before jumping out at them. Crows talk to eachother about what is a danger or not, so if one of them have told another that the scarecrows should be avoided they'll listen to their friends wether they have had a scare themselves or not.
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[Pigeons are not the brightest birds around, they'll let you chase them away without much trouble. Crows will test your vigilance and take advantage of your weaknessess if you let them. If they'd figured out she was not a real threat they wouldn't let her chase them off.]
It might be that they managed to give one of them a good scare once upon a time, creeping up on the unnoticed before jumping out at them. Crows talk to eachother about what is a danger or not, so if one of them have told another that the scarecrows should be avoided they'll listen to their friends wether they have had a scare themselves or not.