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BiologyThe Cuban sparrow breeds between April and June, and constructs cup-shaped nests. In a Zapata swamp these nests were found on top of tussocks. The largest clutch found so far consisted of two eggs (2). These birds are usually observed in pairs, or in groups of three, but are occasionally seen in groups of up to 12 (4). The diet of the Cuban sparrow is as variable as its habitat. In the Zapata peninsula during the flooded season, they feed extensively on eggs of water snails, and also small lizards. During the dry season, this changes to a diet of seeds and small invertebrates. In Cayo Caco, they search for insects on the ground and among plants, and also eat seeds and fruit found in the leaf litter. The population in the Guantanamo province also consume cactus fruits (2).