Description wikipedia

The Cuban gnatcatcher (Polioptila lembeyei) is a species of bird in the family Polioptilidae, the gnatcatchers. It is endemic to Cuba. The Cuban gnatcatcher is 10 to 11 cm (3.9 to 4.3 in) long and weighs 4.5 to 5 g (0.16 to 0.18 oz) and is among the smallest members of genus Polioptila. Like most members of the genus, the male is blue-gray above and white below. It has a unique black crescent behind the eye and ear coverts and a long black tail with white outer feathers. The female is similar but paler, and its facial crescent is thinner. The juvenile is olive-gray above and has buffy flanks, a creamy belly, and only a faint facial crescent. The Cuban gnatcatcher is found along much of the north and southeast coasts of Cuba and also in disjunct areas along the south coast. It inhabits xeric scrubland, mostly below 100 m (330 ft) of elevation.