What Do These Dots Mean? The dots stand for broadcast and communications towers. The colors stand for heights. This is for Texas, winter home of endangered Whooping Cranes. But. . . How many towers are in YOUR state? Find out with a click on the map at Towerkill.com. Be sure to notice the date at the bottom of your state's map. Do you think there are more or fewer towers today? What does this mean for migratory birds? Map: Towerkill.com