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 gouldian finch, one of world's most beautiful birds, requires fire for its food. It feeds mainly on the seeds of one plant - speargrass. It is only after fires - started by accident or by man - have cleared the undergrowth that the birds can reach the seeds on the ground.