Hens like to lay when they see an egg.
More Dutch Proverbs:
He is as welcome as the first day in Lent. (Alluding to fastday.)Dutch
Let God's waters run over God's acres.
Dutch
A penny saved is better than a florin earned.
Dutch
Who buys wants a hundred eyes, who sells need have but one.
Dutch
Might is not right.
Dutch
Eagles catch no flies.
Dutch