[...w h i s p e r...]

Stone looked up as Mud blew a rasberry.
"Mud, you really need yo stop; one of these days humans are going to catch you doing that and suspect us being smart. just stay under the radar, okay?"
Mud looked puzzled. "What radar? Theres no radar to go under! So ha!" He blew another raspberry.
Stone snorted in disgust and began eating grass again.