The square-tailed drongo (Dicrurus ludwigii) is the smallest species of drongo native to sub-Saharan Africa. It reaches a length of 18-19 cm (7-7.5 in). In appearance it is very similar to the fork-tailed drongo (Dicrurus adsimilis), with a black body and red eyes. In both species males are glossier than females. It differs in size, as it is much smaller. It has a shorter and markedly less forked tail, and it is sometimes seen as totally square if the feathers are aligned correctly. Although there are some physical differences between the species, the best way to tell them apart is perhaps on habitats. The square-tailed drongo prefers denser forests, and the fork-tailed drongo is typically found in more open habitats.