546 
BIRD-LIFE. 
high poles, with a cross-piece at the top, from which 
they can better manage to see and capture mice ; planting 
trees of rapid growth is another assistance to them. Such 
expenditure of capital brings in good interest, since the 
posts and trees, used by Buzzards for points of observa¬ 
tion, whence to carry on an uninterrupted war with the 
mice, are of infinitely greater use to the farmer than 
poison and traps. 
