The Cuban Martin, Progne cryptoleuca, is a large swallow endemic to Cuba.

It is closely related to the Caribbean Martin

Caribbean Martin

The Caribbean Martin or White-bellied Martin, Progne dominicensis, is a large swallow.It breeds on Caribbean islands from Jamaica east to Tobago. It is closely related to 2 species to which it formerly was considered conspecific-P. sinaloae and P. cryptoleuca...

, P. dominicensis which breeds on Caribbean

Caribbean

The Caribbean is a crescent-shaped group of islands more than 2,000 miles long separating the Gulf of Mexico and the Caribbean Sea, to the west and south, from the Atlantic Ocean, to the east and north...

 islands from Jamaica

Jamaica

Jamaica is an island nation of the Greater Antilles, in length, up to in width and 10,990 square kilometres in area. It is situated in the Caribbean Sea, about south of Cuba, and west of Hispaniola, the island harbouring the nation-states Haiti and the Dominican Republic...

 east to Tobago

Tobago

Tobago is the smaller of the two main islands that make up the Republic of Trinidad and Tobago. It is located in the southern Caribbean, northeast of the island of Trinidad and southeast of Grenada. The island lies outside the hurricane belt...

, and the P. d. sinaloae (Sinaloa Martin) from Mexico.

It has at various times been considered alternatively as a race of the Purple Martin

Purple Martin

The Purple Martin is the largest North American swallow. These aerial acrobats have speed and agility in flight, and when approaching their housing, will dive from the sky at great speeds with their wings tucked.-Description and taxonomy:...

, Progne subis.

Adult Cuban Martins are 18.5 cm in length, with a forked tail and relatively broad wings, and weigh 40g. Adult males are a glossy blue-black with contrasting white lower underparts. Females and juveniles are duller than the male, with grey-brown breast and flanks and white lower underparts.

The Cuban Martin nests in cavities in banks and buildings, or old woodpecker

Woodpecker

Woodpeckers are near passerine birds of the order Piciformes. They are one subfamily in the family Picidae, which also includes the piculets and wrynecks. They are found worldwide and include about 180 species....

 holes. 3-6 eggs are laid in the lined nest, and incubated for 15 days, with another 26-27 to fledging. Just as the purple martin, this species may compete with other passerines for nesting cavities. In particular, the main foe is the house sparrow

House Sparrow

The House Sparrow is a bird of the sparrow family Passeridae, found in most parts of the world. One of about 25 species in the genus Passer, the House Sparrow occurs naturally in most of Europe, the Mediterranean region, and much of Asia...

 http://purplemartin.org/forumarchives/archive/HSrevenge.htm in urban areas, where they mostly use man-made structures, whereas in more rural locations Picidae

Picidae

The woodpeckers, piculets and wrynecks are a family, Picidae, of near-passerine birds. Members of this family are found worldwide, except for Australia and New Zealand, Madagascar, and the extreme polar regions...

holes in coconut

Coconut

The coconut palm, Cocos nucifera, is a member of the family Arecaceae . It is the only accepted species in the genus Cocos. The term coconut can refer to the entire coconut palm, the seed, or the fruit, which is not a botanical nut. The spelling cocoanut is an old-fashioned form of the word...

 trees are favored, and there is less competition with the sparrows.

Cuban Martins are gregarious birds which hunt for insect

Insect

Insects are a class of living creatures within the arthropods that have a chitinous exoskeleton, a three-part body , three pairs of jointed legs, compound eyes, and two antennae...

s in flight. Their call is a gurgly chew-chew.