okay so I am getting 15 Shadblow Serviceberry trees from my local ag / conversation office next month. I was wondering if the berries would be safe for my chickens or should I not plant any near the new run? It says in their flier that they have been know to attract 40 different wild birds which has me really excited. They are tiny saplings and I still have to find out how fast the grow but they have be really excited. Anyone know anything about them?