THE) WE)B OF FIFE) 
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plants live thus upon each other, and many animals also. 
In Mr. Thomson’s big red book you can read about the 
habits of these lazy parasite plants and animals, about 
the barnacles that grow in the crab’s shell or the tiny 
pea-crab that lives within the horse-mussel. There is 
the horse-mackerel that sometimes swims about under the 
shelter of a big jellyfish’s umbrella, and there is the 
pilot-fish that swims by the side of the shark. But 
perhaps the most striking partnership of all is that of the 
zic-zac and the crocodile. 
The Zic-Zac and the Crocodile 
The zic-zac is a lively little bird that lives in Egypt 
upon the banks of the broad, green Nile. It has a shrill 
