i have five chickens, 2 are barred plymouth rocks, one is a rhode island red, one a 'fry pan special', but resembles a rhode island red and one is an ameracauna . they other night i checked in on them, and spotted an egg. my joy was shortlived. they all began to peck and eat it. it was already broken when i saw it. is this normal , and also i haven't found any more eggs. i check it several times a day. they are all about 4 to 4 1/2 months old. it was at night when i found the egg and i don't know which one laid it.