Product Description: The auks are marine birds widespread in the cooler parts of northern seas. Often regarded as the northern hemisphere's counterparts to penguins, they are accomplished underwater swimmers, able to dive to great depths. Among bird families, they exhibit an unusual degree of variability in their breeding sites, which range from old-growth, temperate forests to barren sea-cliffs and rocky outcrops among mountain glaciers...read more (view table of contents, read Amazon.com's description)