Had a small buck dogging a doe yesterday. I've heard bucks grunt many times before and long tending grunts at that, but never anything like this. He would just stand in one place and watch that doe while letting out loooong 5-10 second grunts followed by shorter ones. If the doe took even a half step he got all riled up. I was surprised every buck in the area didn't show up to check things out with all the noise he was making. Sure wish they would have as I had no intension of shooting him. It was really neat to watch nonetheless!