My advice is just take a deep breath and relax if getting it done via vaginal ultrasound. Sorry if this TMI for any of you, but imagine the vaginal wand as if it were like your significant other putting himself in you.
The runner duck, the Cayuga, the blue Swedish and the buff duck are among the top layer ducks, averaging up to 180 eggs per year. Poor egg layers such as the mallard may lay as few as 60 eggs a year. Some specialized varieties such as the white layer duck can produce nearly 300 eggs a year.
Back to the Questions. How many eggs do wrens & bluebirds lay at a time/in a year? House Wrens typically lay six to eight eggs (but have been known to lay as many as 12!) in one clutch, but they nest only once per year. Bluebirds typically lay six eggs in their first clutch, and four or five in their second.