NORTH AMERICAN BIRDS EGGS. 



[Park greenish brown. J 



The Yellow-billed Loon with the exception of its whitish or yellowish bill in 

 place of the black, is practically otherwise indistinguishable from the common 

 Loon. It averages somewhat larger in size. This is one oi the most northerly 

 breeding birds and it is only within a very few years that anything has been 

 learned about the breeding habits. Their nesting habits and eggs are precisely 

 like the preceding except that the latter average a little larger. Size 3.60x2.25. 

 Data. Mackenzie River, Arctic America, June21,1898. Two eggslaidon island 

 in the river. Nest of twigs and grasses, six feet from the water. Collector, 

 Capt. J. Smythe. 

 9. Black-throated Loon. Gavia arcticus. 



Range. From northern United States northward, breeding along the Arctic 

 Coast. 



This species can be easily separated from the Loon by the gray crown and 

 white streaks down the back of the neck. Its size, too, is about five inches 

 shorter. The nesting habits are the same as the Loons and the eggs have rather 

 more of an olive tint besides having the majority of spots at the larger end. 

 Size 3.10x2.00. 



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