82 ANIMAL ECOLOGY 



winter the Paddies become very thin, owing to the absence 

 of the penguins upon which they depend in summer. 



These instances show that it is not possible to neglect the 

 existence of parasites as a food-supply for other animals, but 

 that they do not usually act as such except m the sense ot 

 being eaten at the same time as their host, by the latter's 

 enemy. 



