I have 12 LF birds I got from a hatchery that I was told hatched 1/19. So they're not yet 4 months. The 2 that turned out to be Roos started crowing at 8 weeks (I gave one away, and the one we kept mates them all, all day long!) and last week we got our first 2 eggs! I wasn't expecting eggs till late June. How common is it for them to mature early?