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A specimen of the Magnificent Frigatebird Fregata magnificens collected in the Galapagos Island by Dr. Koichi Sekiguchi of the Japanese Galapagos Expedition (1959, Kuroda 1961b), is myologically and anatomically illustrated. The frigatebird is adapted for high aerial maneuverability (possessing long forked tail) to harass boobies in the air and steal fish from them, to catch flying fish, or to pick from the water surface newly hatched turtles that have just entered the sea. The frigatebird is unique in body shape (Kuroda 1961b), having a short and deep thoracic body trunk, with massive pectoral muscles which are composed of four parts (Figs. 1, 2, 3, 4 & 5): the proprius (32.0 g), the lateralis (12.8g), the medius (30.5g), and the profundus (6.6g), with also a supracoracoideus (7.3 g) consisting of three parts (Table 1). In total these pectoral muscles weighed 89.2 g, much heavier than the muscle mass of the degenerated legs (10.6 g, Table 1). The proprius and lateralis (which work in down stroke and backward push of the wings) are present in all birds, whereas the profundus (usually of white muscles) is found in soaring and gliding birds (irrespective of taxonomic groups) and acts to provide stability to the wings (Kuroda 1960). However, the frigatebird is unique among birds in possessing the medius-layer, reflecting its high flying ability (Kuroda 1961a). In addition, the profundus in the frigatebird was confirmed to be red muscle.

Fragmental Notes on Avian Morpho-anatomy: 6. Notes on Myology and Anatomy of the Magnificent Frigatebird Fregata magnificens