We have a Swan Cygnet in our Loch here in Scotland that was the only survivor of a 2015 brood of five Cygnets and has never left.This year we thought it would leave with the the three Cygnets of 2016`s brood but it is still here! it is now taking early morning spells of egg sitting that the Pen has laid. Is this a frequent occurrence ? (Picture is the Cygnet with the Pen in the Background)