"Exceedingly common throughout the group. Most abundant about scattering trees in open fields. Breeds." (Bourns and Worcester MS.) The tic-wee buzzard is the commonest hawk in the Philippines and on Calayan and Batan Islands it occurs in immense flocks during migration. Genus HALIÆETUS Savigny, 1809. Bill stout, culmen straight at base, then greatly curved, with a long overhanging hook, edge sinuate; tail rounded, its feathers wide and pointed; tarsus heavy, feathered for a short distance in front; a row of large transverse plates in front, a row of large hexagonal scales behind, sides covered with small hexagonal scales. 190. HALIÆETUS LEUCOGASTER (Gmelin). WHITE-BREASTED SEA EAGLE. Falco leucogaster Gmelin, Syst. Nat. (1788), 1, pt. 1, 257. Haliaetus leucogaster Sharpe, Cat. Birds Brit. Mus. (1874), 1, 307. Haliaëtus leucogaster Sharpe, Hand-List (1899), 1, 267; Oates, Cat. Birds' Eggs (1902), 2, 279; McGregor and Worcester, Hand-List (1906), 43. Ma-na-ol', Ticao, Manila. Bantayan (McGregor); Batan (McGregor); Basilan (Bourns & Worcester, McGregor); Bohol (McGregor); Bongao (Everett); Calamianes (Bourns & Worcester); Calayan (McGregor); Camiguin N. (McGregor); Cebu (McGregor); East Bolod (Mearns); Fuga (Whitehead); Luzon (Bourns & Worcester); Masbate (Bourns & Worcester, McGregor); Mindanao (Steere Exp.); Mindoro (Bourns & Worcester, McGregor, Porter); Palawan (Whitehead, Platen, Bourns & Worcester, White); Romblon (Bourns & Worcester); Samar (Steere Exp., Bourns & Worcester, Whitehead); Semirara (McGregor & Worcester); Sibuyan (Bourns & Worcester, McGregor); Siquijor (Bourns & Worcester); Sulu (Bourns & Worcester); Tablas (Bourns & Worcester, Celestino); Tawi Tawi (Bourns & Worcester); Ticao (McGregor); Verde (McGregor); Y'Ami (McGregor). Indian Peninsula; Indo-Chinese Provinces; Malay Peninsula to Australia and Oceania. Adult.--Entire head, neck, and lower parts white, many of the feathers with blackish shafts; tail blackish, its terminal third white; primaries blackish with white bases; axillars and wing-lining white; remainder of wings and upper parts bluish slate-gray, with a slight mixture of brown. Male from Ticao: Iris dark; bill at base and cere horn-blue; bill at tip and nails black; legs and toes white. Length, 685; wing, 550; tail, 230; culmen from base, 52; tarsus, 91. The female is said to be slightly larger. Young.--Head, chin, and throat buffy or pale yellowish white, more or less streaked with light brown; general color brown, darker above, many of the feathers with lighter brown or whitish shaft-lines which widen at the tips; primaries black with whitish bases; end of tail brown, basal two-thirds white mottled with brown.