When you camp on the shores of a fresh water lake during loon mating season, all night long you have to listen to the male loon's mating call. "Woooo, Woooo,.... Come here, honey! Come here, honey!"
One gets the impression that loons evolved from raccoons. A loon is nothing more than a stomach that dives, while a raccoon, the loon's land based counterpart, is a stomach with a mask on its face.
For the loons, just like for people, the best action happens at night. "Woooo, Woooo,....Come here, honey! Come here, honey!"