Food habits.—The honey-eater feeds partly on insect life and partly on nectar and juices from flowers. At Guam, the honey-eater was frequently found at flowers of the ink berry bush, where evidently both nectar and insects were obtained. The birds were attracted also to the coconut palms, especially when the reproductive parts of the palms were developing.
Remarks.—The Cardinal Honey-eater is one of the most conspicuous land birds in the Mariana Islands. Its scarlet plumage and characteristic fluttering flight cause it to stand out against its habitat of forest, scrub, and garden. At Guam, the author (1947b:124) found the honey-eater on 37.6 percent of the 125 roadside birds counts made in 1945. The species included 3.9 percent of all of the birds observed on these counts. Seale (1901:55) and Strophlet (1946:540) also commented on its abundance at Guam; however, in 1931, Coultas (field notes) wrote that the bird was rare; he obtained only one skin at Guam. At Rota, the NAMRU2 party found the honey-eater to be abundant. Coultas obtained only a few birds at Tinian and Saipan in 1931. In 1945, Downs (1946:103) saw only a single pair at Tinian; Gleise (1945:220) estimated the population at Tinian to be 12 in 1945. At Agrihan, Borror (1947:417) reported that the honey-eater was a common bird in 1945.
[Table 49] lists the measurements of males of M. c. saffordi from several islands in the Marianas. Measurements of birds from Guam, Rota, Tinian, and Saipan are fairly similar, although the birds at Saipan seem to have a slightly longer wing than those at Guam. A single skin from Agrigan has larger measurements than those of birds obtained in the southern Marianas. Whether the birds in the northern Marianas are separable because of larger size can only be ascertained by the studying of more material from that region.
Mayr (1945a:102) writes that males of M. cardinalis seem to outnumber the females by approximately four to one. On the basis of collections and field observations, the males were found to outnumber the females in the Micronesian islands; although the ratio may not be so great as four to one. At Guam, the NAMRU2 party obtained 21 males and 8 females. Although these birds are often seen as pairs (male and female), single males are frequently observed. The females do not appear to have more secretive habits than the males.
Myzomela cardinalis kurodai Momiyama
Cardinal Honey-eater
Myzomela rubratra kurodai Momiyama, Birds Micronesia, 1922, p. 17. (Type locality, Yap.)
Myzomela rubratra Hartlaub and Finsch (part), Proc. Soc. London, 1872, pp. 89, 94 (Uap); Gräffe, Journ. Mus. Godeffroy, 2, 1873, p. 122 (Yap); Finsch (part), Journ. Mus. Godeffroy, 8, 1875, p. 4 (Yap); Forbes (part), Proc. Zool. Soc. London, 1879, p. 271 (Yap); Wiglesworth (part), Abhandl. und. Ber. Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p. 31 (Uap); Oustalet (part), Nouv. Arch. Mus. Hist. Nat. Paris, (3), 7, 1895, p. 202 (Yap); Takatsukasa and Kuroda (part), Tori, 1, 1915, p. 64 (Yap); Kuroda, Dobutsu. Zasshi, 27, 1915, pp. 331, 332 (Yap).
Myzomela rubrata Matschie (part), Journ. f. Ornith., 1901, p. 112 (Yap).