Il ON ANIMAL LIFE 67 
One kind of slave-making Ant has_be- 
come so completely dependent on their slaves, 
that even if provided with food they will die 
of hunger, unless there is a slave to put it 
into their mouth. I found, however, that 
they would thrive very well if supplied with 
a slave for an hour or so once a week to clean 
and feed them. 
But in many cases the community does not 
consist of Ants only. They have domestic 
animals, and indeed it is not going too far to 
say that they have domesticated more animals 
than we have. Of these the most important 
are Aphides. Some species keep Aphides on 
trees and bushes, others collect root-feeding 
Aphides into their nests. They serve as cows 
to the Ants, which feed on the honey-dew 
secreted by the Aphides. Not only, more- 
over, do the Ants protect the Aphides them- 
selves, but collect their eggs in autumn, 
and tend them carefully through the winter, 
ready for the next spring. Many other insects 
are also domesticated by Ants, and some of 
them, from living constantly underground, 
