Pond Life 
snails which live in them, and these 
are thus carried about by the caddis- 
worm, and used by it as building 
materials, without their consent ever 
having been asked. 
Besides these caddis-flies there are 
many other insects which hatch out 
into cock-tailed flies, like miniature may- 
flies. Each tiny fly hatches and floats 
lightly on the surface like a small winged 
fairy, with its three tail-whisks stuck 
jauntily upwards. Its wings are so 
delicate as to be almost transparent ; 
some are of a slight yellow tinge, others 
more olive in colour, or blue, or reddish, 
as the case may be. Though so small 
and transparent, they are eagerly sought 
for by the different fish, and have an im- 
portance all their own among fishermen. 
The most important pond-fish is the 
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