BIRD ROCK 



183 



guished in these pictures and are therefore grouped 

 under one head, it being calculated that about from 

 fifteen hundred to two thousand individuals of these 

 species make the Rock their home. Of this number 

 probably not more than one hundred are Puffins, 

 while the Common and Briinnich's Murres ( Uria 

 troile et U. lomvia) outnumber the Razorbills at 

 least four to one. 



The Kittiwake population of the Rock probably 

 numbers between six hundred and eight hundred 



98. Gannets. x 3. An enlarged detail of No. 99. 



birds ; of Gannets, there are perhaps left only fifteen 

 hundred of the more than one hundred thousand 



