66 THE STORY OF THE BIRDS. 
icry among the birds, unless the resemblance which 
the European cuckoo has to the European sparrow 
hawk be such. It has been thought that, because of 
this, the former can more easily frighten smaller birds 



Sparrow hawks. 
away from their nests while it deposits its egg within 
them. By reference to the illustrations, this resem- 
blance can be noted. 
Among mammals there are some forms of shields, 
but, so far as known, while some birds carry swords, 
