Found in pairs or family groups all year, it is often heard before it is seen; the birds call to each other constantly as they busily clamber about on the branches. Nuthatches have fairly short, but strong, legs and feet for clinging to tree trunks. Whether foraging in flocks or alone, nuthatches descend trees headfirst in their search for nuts, seeds, and invertebrates. There are twenty-eight species of nuthatches in one genus in the Sittidae (pronounced SIT-tuh-dee); a family with representatives in North America, North Africa, and Eurasia. A group of nuthatches are collectively known as a "jar" of nuthatches. Its wings are bluish-gray in color. document.write("