Purchased these on hatch day Feb 28, 2018. They are 4 weeks old. However, they have been developing very differently with wing feather and tail feather growth. Also, their comb and wattles are also on different growth rates. Here is a link to a recent thread with weekly wing pics where you can see a lot of differences. https://www.backyardchickens.com/threads/wing-comb-development-black-jersey-giants.1225955/ Here is this week's pics of comb and wattles, and tail feather growth: Their names will be Jupiter (male) and Juno (female) - but we don't know whom to call which name!