Clubbing is an enlargement of the ends of the fingers and a downward sloping of the nails. Although it's not caused by chronic obstructive pulmonary disease (COPD), it can be a sign of coexisting lung cancer or other lung disorders in patients with COPD. Clubbing is sometimes called digital clubbing. It can affect the fingers and/or toes.
Relatives. Darwin's finches can be divided into groups based on beak type. There are three species of tree finch: the small tree finch, medium tree finch, and large tree finch. Tree finches have grasping beaks.
Northern Cardinal: This large crested finch has a vivid red body. The black mask and chin contrast with a heavy red bill. Female is duller overall, with red wings and tail washed with gray, and smaller crest. Forages on the ground in trees and bushes. Feeds on seeds, grains, fruits, insects and snails. Hops instead of walking on the ground.