...just keep your ears to the ground.
Reminds me of a joke: A Confederate soldier was given the job of supplying his regiment with food. So to help him, he hired an Indian scout. The two of them set off on their journey to find some buffalo.
After riding for hours, the Indian gets off his horse, puts his ear to the ground and says, "Hmm...buffalo come."
The soldier looks all around but sees nothing. A little confused, he says to the Indian, "I don’t see anything, how do you know buffalo come"?
The Indian replies, "Ear Sticky!"