Mammals and Birds : Lifespans of Wild Populations 101 



royal albatross {Diomedea epomophora) this figure even goes 

 down to 3 per cent. A summary of investigations on mortality 

 rates in non-passerine birds is given in Table II (based on 

 Farner, 1955 and completed after Bendell, 1955; Hickey, 



Table II 



Summary of ustvestigations ox mortality rates 

 IX xox-passerixe birds 



1955; Lack, 1956; Richdale, 1957; Boyd, 1957, 1959; Summers- 

 Smith, 1959; and Southern, 1959). The adult mortality rates 

 given there apply after the first 0-5 to 1-5 years, according 

 to the species or groups concerned. The juvenile mortality 

 rates are calculated for a year beginning with the fledgling 

 leaving the colony, or sometime later during the summer of 

 hatching. 



