Pd Carain 1966 Species Record - Beavards #13 Bonin Island Petrel Day San 10.16 + 20-23 June Immatures Bonin Islands are common to abundant just after dark about the entrances to their burrows, but become increasingly scarce toward morning light. Most of these are fully feathered and practically indistinguishable from the parents, but a small percentage, ca. 30%, still have tufts of the down attached to their feathers. A few adults are noted feeding young at times, but apparently the majority of these young are unattended by this time. A few have been noted floating out in the water along the west shore, so apparently these young are in the process of going to sea. An estimated 3000 remain on the island. These are scattered over most of the vegetated area, but more numerous in the brood grass along the N.W. side. Ly June. A few more adults noted feeding the immatures at the burrow entrances. There is a distinct difference between the plumage of the adults and immatures. The young of course have broad head plumage, and this in itself lends an overall appearance of brightness; also most feathers over the dorsal area of the young (secondaries, all wing