ECOLOGY AND LIFE HISTORY OF THE COMMON FROG 



season must carry with it the risk of death for the eggs, if the weather 

 should prove unfavourable. 



There is a natural tendency to consider that early spawning is an 

 advantage, so that an area in which frogs spawn early is considered to be 



Rono tcmpororlq pqrvipolmcto 



Rang tcmpororio ttmporqriq 



Fig. I. Map Showing the Distribution of the Common Frog in Europe 



better for the animals than another area where spawning is much later. 

 This, however, is not necessarily true. Other species of Anura spawn at 

 other times, often during the summer when there is no danger from 

 frost. Moore (1939) is surely right in thinking that each species must be 



