When hunting upland game flushing dogs (spaniels and retrievers) work much more closely with the hunter. Flushers will not cover the same amount of ground as a pointing dog as the flusher must be kept within shotgun distance. Flushing dogs are often used on birds that run from the hunter. On such birds as pheasant, an aggressive flush is necessary to spring the bird to wing. Flushing dogs excel on these types of bird because they do not point the birds, giving them little time for escape on the ground. Pointing breeds are used on such birds, but must be well trained to know when the bird pointed has moved.