We picked up three Silver Laced Wyandottes and a Buff Plymoth Rock pullet a few weeks back from the same place . So far they've been very healthy and happy birds . Today we noticed the three wyandottes have some clear watery nasal discharge . No other symptoms . Eating and drinking as usual , active and appear to be in excellent health otherwise . Eyes look normal and healthy . They don't sound rattly or anything just have a bit of clear discharge . Non of the other chickens have it just the three wyandottes . What could this be caused by ? Should I be concerned ?