only the striped sunflower seeds float for that method
 
but i prefer  (+)  the scope.... and 1500 FPS lead
 
i've trained the crows to fly off with the dead munks
 
because a Raven knows how they think 

and they are very accustomed to getting our meat scraps
 
i have a 55 gallon drum with a plywood top
and that is their trusted feeding platform
 
this morning i had 5 crows on the ground eating