OK,
@Perris, you convinced me. I bought two cans of sardines in olive oil for the girls and tried it out.
Trudy (BR), who is always on the absolute verge of death from starvation, went wild, stole every one she could get, and didn't slow down until after the fifth one. Buffy (BO) was hesitant at first but then was kinda ok, I'll try, I guess, and picked at two (until Trudy found them.) Lil (EE) was utterly revolted after one peck and never tried one again.
There was a LOT of beak-wiping in the pine straw and dead leaves.
They're cheap, I'll give you that, but ewwww. (My husband says he likes them.) I think I like them better swimming in their schools of thousands in the aquaria of Monterey Bay Aquarium. Off to wash my hands again.