360 THE ZOOLOGIST. 



important activity is proved by the observations of Bela v. Hauer, an 

 estate owner. He tells us that the Rook, on the pastures, not only 

 frees the domestic animals from their external parasites, but that 

 it pulls the gastrus larva from the exposed anus of Horses, and that 

 it picks also the " proglottidas " of Tcenia ccenurus from the dung 

 of shepherd's-dogs, thus limiting the spreading of the staggers of 

 Sheep. 



Game-raising is in no way compromised by the Eook ; and it thus 

 differs from Corvus comix and corone. It never attacks young Hares, 

 and nev^r destroys birds' eggs. It has been proved by experience 

 that small game and singing- birds multiply even in the neighbourhood 

 of stron? colonies. 



