Since the birds do not emit any odor the #gravyseals have lost their sense of smell. Instead they relay on echo location similar to bats to find their prey.
Miners who have turned off their Jazz music say when a gravyseal is close you can hear a sound similar to the roadrunners beep beep.
Many say it is not safe to use Acme products at the north pole. But others say that is just an old miners tale caused by watching to many Looney Tunes .
The other place that used to have starch deposits is Florida. There they used to cultivate huge herds of Atala butterflies that would feed on coonties. They would milk the butterflies and get a milky substance similar to #gravy that they would dry and box up as Arrowroot starch.
Overtime the butterflies ate most of the coonties so the #gravy syndicates were forced to move north to the pole.