We just bought 2 lady and 1 drake pekin ducks, but we have no idea how old they are and they aren't laying - we've searched everywhere. They are free ranged with a large pond that they stay near or in 24/7. I have literally scoured every inch of our property and there is nothing. I'm certain they aren't laying...unless the eggs are plopping in the pond! How can I tell how old they are, to determine if they aren't old enough to be even laying at this point?