Of course you shouldn’t season the birds. It makes them salty.
They do say if you can sprinkle salt on a bird’s tail you can catch it
But this is of course just one of those “if (impossible thing) then (other impossible thing)” jokes that older generations seem to love throwing at their kids
Alongside “you won’t get sick from smoking a cigar if you chew gum while smoking it”
And also possibly “the most effective birth control is to hold an aspirin between your knees” (because it keeps your legs closed and prevents sex, lol haha very funny)