My white rock and 2 barred rock chickens have been jumping on the tree and on the chain link fence next to the apricot tree and eating the leaves. They don't bother the cherry tree leaves at all but they did eat the cherries. Is this normal behavior and is it safe to eat because I read that the apricot seeds contain arsenic. Are my chickens lacking something in their diet? I do give them lettuce occasionally. These 3 chickens are less than a year old and they have so much personality. I just love them. They are my only egg layers now as my other 4 hens are over 4 years and have pretty much stopped laying. Any info would be appreciated.