DeBenedictis 1469 227 March 8 Cocos Island, Costa Rica The Redfooted Boobies all have a pale ashy blue bill and about the same color of facial skin. The immus. are darker and have a dark blue bill with pink facial skin and dull pink-red feet. The Brown Boobies are darker than the Red-feets in all plumage, The bill is a pale flesh color and the facial skin yellow in the adults. The immus. show the adult feather pattern in dark brown and a mottled dark brown, and the bill and facial skin is dark bluish. The two species are easy to separate at fairly close range, but further out - ?. They flew out in, often in mixed species groups of 7-12, and smaller groups of one species. Adult Brown (?) and Red-footed were seen at all distances, but immus, were seen only as we got fairly close to Cocos. Cocos is a beautiful island. It has 2 main characteristics. It is steep as all hell, rising at at 60-70° angle from the sea everywhere. The surface is deeply scarred by Gn. cucks which have eroded deep valleys down to the ocean. Apparently there had been little rain recently, for the stream was only a pleasant brook, not a roaring cascade. From a distance the next most impressive feature is the greenness of the island. Lemi-bare rock cliffs are to be seen only at the coast; elsewhere the vegetation covers everything. The cliffs, for the most part, are not high near Christan Bay, where we docked. The "Bear" came to e.