Lone Ranger and Tonto.

The Lone Ranger and Tonto are riding through the great plains, when they 
happen upon a small city, located on the transcontinental railroad. As 
the two approached the tracks, Tonto jumped off of his horse and quickly 
placed his ear to the ground.

"What is it ?" asked the Ranger. 

"Iron Horse come." replied Tonto. 

"How can you tell?" asked Lone. 

"Tracks rumble" said Tonto. 

Sure enough, a train was sighted coming down the 
tracks only a few miles away. With the Lone Ranger fully impressed, the 
companions mounted up, and started across the plains once more.
A few hours passed before Tonto dismounted once more, and placed his ear 
to the ground. 

"What is it Tonto?", asked the Ranger. 

"There are no train tracks anywhere around here." 
After a second , Tonto replied 

"Buffalo come". 

Lone remembered the trick from back in town, and asked again "How can you tell?"  

Tonto replied "Ear sticky"