CUCULUS. 377 
The birds belonging to this genus have very long graduated tails, very 
short tarsi, and are without metallic colours in the plumage. 
This genus probably contains from thirty to forty species, which are dis- 
tributed throughout the Old World up to the Arctic circle. One species 
only is found in Europe, which is a regular summer visitor to the British 
Islands. 
The birds in this genus are found in most districts, but chiefly frequent 
well-wooded country. They are shy and wary, and fly quickly, with a 
very Hawk-like aspect. Their food is almost entirely composed of insects 
and their larvee, especially caterpillars. Their notes are loud and full, but 
sometimes very harsh. In their breeding-habits they are most peculiar, 
for they make no nest, but lay their eggs in that of other birds, leaving 
their young to be reared by the foster-parents, 
NEST OF CHOUGH, 
