ISO BIKD STUDIES WITH A CAMERA 



shared their iindorground homes, one bird's nest 

 being at the end of the burrow, the other abont half 

 way to the entrance. The Petrels also occupied 

 burrows of their own, which, judging from the 

 actions of the birds found in them, they had exca- 

 vated ])y the aid of their toes."''^ 



The Petrel's nests were composed of fine grasses 

 and a few feathers, and one nest contained two bits 

 of white birch bark, the presence of wliicli raised 

 the ciuestion as to whether these gleaners of the sea 

 do not gather suitable nesting material when they 

 iind it floating on the surface of the water. Two of 



.4 



'.i.'i. lA'Uflr.s l'ctl\'l <jll liust at uln_l nf cxuiuatuil Imtluw. 



the eight or ten Petrels' nests examined contained a 

 singh^ white egg; one egg constituting a full set 

 with this species, as with all the other rock-nesting 

 ])ii-ds, exccqjt the Kittiwake. The remaining nests 



