Me and my wife were out side watching one of our hives when we noticed three bees come flying out as if they where fighting. They hit the ground and we watched them there was two bees attacking this very small bee that looked as if had not been alive very long it still looked very small. The other two bees attacked her for a few minutes. I thought maybe it was some type of insect other than a bee the were killing nope it was one of there on. After they left I picked the small bee up she was just trying to survive but was about to die so I ended it for her. Why did my bees do this what where they doing?