PLATE XII 



Fig. I. Macronectes giganteus and chick. Signy Island, 19.1.33. The 

 bird is a "dark intermediate" and the chick is in light grey down. 



Fig. 2. Colony of M. giganteus, Michelsen Island, EUefsen Harbour, 

 4. i. 33. The general lightness in plumage of the nesting birds is illus- 

 trated. Two white birds are in the centre, and all the rest, with the 

 exception of the bird in the left foreground, are "light intermediates". 



Fig. 3. Pygoscelis papua feeding young, Ellefsen Harbour, 13.1.33. The 

 parent bird has climbed on to the rock in order more conveniently to 

 carry out the operation, the chick being almost as large as itself. 

 Fig. 4. Chionis alba. Ellefsen Harbour, 12. i. 33. Three birds standing 

 in a characteristic statuesque pose on a rock which contains a nesting 

 hole. The approach to the hole is littered with rubbish which appears 

 lighter than the surrounding rock. 



