Allen's Gallinule

Allen's gallinule, formerly the lesser gallinule, is a small rail with a short red bill, greenish back, purple upperparts and red legs with long toes. Breeding males have a blue frontal shield, green in the female. Wikipedia describes it as found year-round in marshes and lakes in sub-Saharan Africa, with vagrants reaching Europe (Wikipedia, general species account).

It is secretive in the breeding season, mostly heard rather than seen, with a sharp nasal pruk call. It builds a floating nest and lays two to five eggs, and eats mainly insects and aquatic animals. The source gives no Sri Lankan range, so its place on the Sri Lankan list should be checked. The 2012 National Red List gives no status under this name.