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.
ploceidae the ploceidae finch family consists of the weavers and whydahs types of finches these finches are found mainly in africa though some are in europe and asia they are small seed eaters and most are very hardy there are several subfamilies and 156 species of finch bird in this family