The Allen's Gallinule, formerly known as the Lesser Gallinule is a small waterbird of the family Rallidae. Its former binomial name is Porphyrula alleni. Its breeding habitat is marshes and lakes in sub-Saharan Africa. They build a floating nest in marshes and swamps, laying 2-5 eggs. This species is partially migratory, undertaking seasonal movements. Remarkably, this apparently weakly flying bird is not only the only species with a purely sub-Saharan African range to have reached Great Britain, but has done so twice. It has also occurred as a vagrant in several other European countries.