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.
The nine subspecies differ mainly in the color of the body plumage. Like other nuthatches, the white-breasted nuthatch forages for insects on trunks and branches, and is able to move head-first down trees.ike other nuthatches, the white-breasted nuthatch forages for insects on trunks and branches, and is able to move head-first down trees.