RED-THEOATED DIVER. 261 



then been killed in the summer months, but Mr. H. 

 Miller informs me that it usually leaves Morecambe Bay 

 about the end of April, appearing again in October or 

 November. It is not often seen on the inland lakes, and 

 is relatively much rarer in such places than the Great 

 Northern Diver. 



FAMILY PODICIPEDID.E.— GENUS PODICIPES. 



GREAT CRESTED GREBE. 



PoDiciPES CRiSTATUs (LinntEus). 



The Great Crested Grebe is a resident species, breed- 

 ing regularly in at least one locality ; but in most parts 

 of Lancashire is only known as a casual winter visitor. 

 When frozen out from the lakes and meres, which it 

 frequents throughout the country in summer, it migrates 

 to the sea, and is then often seen close in shore on the 

 coast and river-estuaries. Probably it is when on its 

 way thither, and reluctant to leave the fresh water 

 except as a last resource, that it halts sometimes by the 

 larger streams, reservoirs, and lakes (until they too 

 become ice-bound), and on many of these it is of pretty 

 regular occurrence. On the lake in Knowsley Park Mr. 

 J. J. Hornby writes me that there are always two or 

 three pairs, except when, in very hard weather, the 

 water is frozen up, and that they breed regularly, 

 though the Swans destroy some of the nests ; on the 

 26th of June, 1879, he saw a nest containing two eggs. 



