I've been raising chickens for years, but this is my first foray into coturnix quails. My quail, which are housed separately from the chickens, have been laying for about two months. During the first couple weeks, the egg shells were so dense they were difficult to crack open. But now they are so fragile you can almost dent them just by picking them up! Is that normal? I've spent hours reading through the threads on here, but I couldn't get a definitive answer. Some people said it was normal, some people said it wasn't. Should I be giving them oyster shells like I do the chickens? Also, one other weird thing I noticed with the eggs, every fifth egg or so seems to have a "chalky" appearance. The other eggs are either blue, blue with brown splotches, or cream with brown splotches. Is that normal?