yes here's a tip....  and i know this from having a parrot for twenty years.
In the parrot food there was always dried hot jalapeno' peppers.... and i often wondered
why they liked to chew on them....  tried it once and it was a 3 alarm fire in my mouth HOT! 
 it  doesn't affect the birds palate (OR TONGUE) for some reason....
same thing applies to our native Birds: so->  give them a 3 alarm fire in there mouths 

 buy a CAYENNE pepper bottle of spice or several of them at an outlet store
and put some (dampened with a fine water spray) sunflower seed out for them
with cayenne pepper liberally coated and as they stuff their faces or eat them
they'll soon  be running for water,,,