The cinnamon bittern or chestnut bittern (Ixobrychus cinnamomeus) is a small bittern. It is of Old World origins, breeding in tropical and subtropical Asia from India east to China and Indonesia. It is mainly resident, but some northern birds migrate short distances.This is a small species at 38 cm (15 in) length, though is one of the larger Ixobrychus bitterns. Possessing a short neck and longish bill, the male is uniformly cinnamon above and buff below.