We have 3 Isa Browns and were told they were all pullets but 1 of the 3 looks a bit different. I've noticed the difference for over a week and they are only 2 weeks old. One has feathers on it's wings that are much shorter then the other 2 chicks. The first 2 pics are the same bird and the last 2 are one of the other birds. Here are some pics. Please let me know what you think. Thanks!