The nature of the common loon, from biology to behavior, from one of the world’s foremost observers of the revered waterbirdEven those who know the loon’s call might not recognize it as a tremolo, yodel, or wail, and may not understand what each call means, how it’s made, and why. And those who marvel at the loon’s diving prowess might wonder why this bird has such skill, or where loons go when they must leave northern lakes in winter. For these and so many other m...