BIRDS. 



Plate XIII. 



The feet and legs of McCormick's Skua {Megalestris maccormiclci) at ages 

 corresponding to the heads iu Plate XII. Fig. 1, the leg of a nestling when first 

 hatched ; fig. 2, of a nestling from two to three weeks old : fig. 3, a stage of colouring 

 reached at the shedding of the downy plumage ; fig. 4, the leg of a normal adult ; 

 tig. 5, of an adult, abnormally piebald {see p. 68), in which the colouring of the 

 immature bird has persisted. 



