Crows are sneaky bastards. I often put out leftover meat bits around the window, so it wouldn't rot in the bin.
Crows are the first that come and after some tasting, stuff their peaks with meat and leave. The fuckers sit on the top of the neighboring house and watch if I'm at home. If they see I'm roaming around they fly to the window and start marching. Marching means they walk up and down on the galvanised plate-covered ledge signaling me, that they want some treats.
If you ignore them for too long or don't have any leftover cheese or meat for them they come over, pull out the fresh plants from the ground and leave. :D