Buffalo come

The Lone Ranger and Tonto are riding across the dusty prairie. There is nothing but grass in every direction. The Lone Ranger says to Tonto.
“It is very quiet. You are a Red Indian and skilled in the ways of the wild. What is happening”
Tonto gets off his horse and lays down on the ground. After a minute or two he gets up and says,
“Buffalo come”
“That is amazing” says the Lone Ranger, “How do you know”

Tonto replies, “Ear sticky”