The sandhills with the red caps are adults, those without are juveniles. There is no visual difference between male and female sandhills, but the females give a higher, longer call than the males. There are apparently two families of sandhills on your property, and the one pair with the youngster have established their territory on your land, and the others are trying to intrude. That's why they are being run off. It's all healthy behavior. GHH
