I spend a lot of time in the off season with either frozen birds from the year previous or pheasanted scent rubbed on cloth bumpers. Sometimes I throw and let her mark retrieves, while other times I'll make a loop around our training field throwing in bumper/birds, then go get her and move from area to area trying to find the "dead bird". Make sure to throw the target to the final hiding spot, otherwise a dog will just follow your scent trail from dead bird to dead bird. :thumbsup:
I also use a different command for finding a dead bird than for when we are on the move through a field.