HYMENOPTERA. 349 
butable to intelligence. Again, the bees give different sorts of food 
to the different sorts of larve. They know how to change this 
food when an accident has deprived the hive of its queen, and it 
is necessary to replace her; this is another proof of intelligence. 
But it is, above all, in the face of an enemy that the intellectual 
faculties of these insects show themselves. There are always at 
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Fig. 323.—Sentinel Bees guarding the entrance to the hive. 









the entrance of every hive three or four bees, which have nothing 
else to do but to guard the door, to keep a watch over incomers 
and outgoers, and to prevent an enemy or an intruder from 
slipping into the community. When one of them perceives an 
enemy on the borders of the hive, it dashes forwards towards it, 
and by a menacing and significant buzzing warns it to retire. 
If it does not understand the warning, which is a rare occurrence, 
