qT=2&tQ=This bird loves to put on a show, especially at the end of a summer social gathering.&tC=Pink-headed duck|American woodcock|Common loon|Canvasback&cC=3&fB=After summer ends, adult Common loons congregate in groups of 15 to 20 for some synchronized dancing. One loon puts on a show of bill-dipping, head-turning, jerky-swimming and splash-diving, while the others swim around it in a circle.<br><br>If anyone tries to invade their social gathering, the birds will attack the party-crashers.