North American BiRrxs Eggs. 



53 



105.1 Kseding Petrel. Oiranodroma kci'diiujt. 



This bird is similar to Leaeli Petrel, but is smaller and the tail is less deeply 

 forked. Its range is from California to Panama breeding on the Kevillagigedo 

 Islands off ^Mexico. 



106. Leaoh Petrel. (>f('iini>(1n>ma IcariirrhiKi, 



Range. — North Atlantic and North Pacific Oceans, bieeding from Maine and 

 from the Farallones, northward to Greenland and the Aleutians. 



These are the most common of the Petrels found on our coast; they are eight 

 inches in length, of a sooty brown color, and have a white rump. The forked 

 tail will at once distinguish them from any of the Atlantic Petrels. They nest in 

 burrows in the ground, laying a pure white egg, sometimes with a very faint 

 tlusty wreath about the larger end. Size 1.20 x .95. These birds generally take 



turns in the task of incubation, one remaining at sea 

 during the day and returning at night while his 

 mate takes her turn roving tfie briny deep in search 

 of food. The young are fed by regurgitation upon 

 an oily fluid which has a very offensive odor. This 

 odor is always noticeable about an island inhabit- 

 ated by Petrels and is always retained by the eggs 

 or skins of these birds. They are very rarely seen 

 Hying in the vicinity of their nesting island during 

 the day ; the bird that is on the nest will remain 

 until removed by hand. Data. — Pumpkin Is., 

 Maine, June 22, 1893. Single egg; nest of a few 

 grasses at the end of a burrow dug in the baik. 

 Collector, J. Lefavour. 



[White 1 



\ 





106.1 Guadalupe Petrel. Ocr/dioilroina macroflartjjla. 



This species, which is very similar to the preced- 

 ing, except for a longer and more deeply forked 

 tail, lireeds on Guadalupe Is. Their eggs are wdiite 

 very minutely wreathed with reddish brown ; they 

 are, however, nearly always nest stained to an uneven 

 brownish color. Data.— Guadalupe Is., Lower 

 California, March 24,1897. Single egg laid on a few 

 oak leaves and pine needles at the end of a three foot 

 burrow. Size of egg 1.40 x 1.00. Collector, A. W. 

 Anthony. 



^-fl^^V^l^ 



liite. iicst stained. I 



(07. Black Petrel. Occawidroina mclanid. 



Range. — South Pacific, from soutliern California southward, breeding on the 

 small islands on botfi coasts of Lower California. They are similar to the Leach 

 Petrel except that the rump is blackish. Data. — San Benito Is., Lower Califor- 

 nia July 23, 1896. White egg laid on bare ground at the end of three foot bur- 

 row'. Size 1.40 X 1. Collector, A. W. Anthony. 



