Hello all I have some Mallard ducks eggs in my incubator that just started "piping" today. Should I help them out? I read that Mallards sometimes have a difficult time hatching out. How long should I let them go without interfering if at all? As you can tell this is my first time with duck eggs. I have only hatched chickens and quail. Any advice that you can give to this duck-hatching newbie would be greatly appreciated! They have been incubating for 23 days. Thanks!