My Silver Welsh Harlequins are just 3 weeks old and they are from Holderread. I purchased 6 but was gifted a 7th. I only live 45 minutes from them so it was a local pick-up. lol. This is my first time at raising ducks as well and I totally understand the growth rate amazement! I have 4 males and 3 females. I love to watch them around the yard, too funny. I only plan on keeping a mating pair, for eggs and slug control of my front 1/3 acre.