The most absurdly human, however, among all the tricks and habits of ants are their well known cattle-farming and slaveholding instincts.  Everybody has heard, of course, how they keep the common rose-blight as milch cows, and suck from them the sweet honey-dew.  But everybody, probably, does not yet know the large number of insects which they herd in one form or another as domesticated animals.  Man has, at most, some twenty or thirty such, including cows, sheep, horses, donkeys, camels, llamas, alpacas, reindeer, dogs, cats, canaries, pigs, fowl, ducks, geese, turkeys, and silkworms.  But ants have hundreds and hundreds, some of them kept obviously for purposes of food; others apparently as pets; and yet others again, as has been plausibly suggested, by reason of superstition or as objects of worship.  There is a curious blind beetle which inhabits ants’ nests, and is so absolutely dependent upon its hosts for support that it has even lost the power of feeding itself.  It never quits the nest, but the ants bring it in food and supply it by putting the nourishment actually into its mouth.  But the beetle, in return, seems to secrete a sweet liquid (or it may even be a stimulant like beer, or a narcotic like tobacco) in a tuft of hairs near the bottom of the hard wing-cases, and the ants often lick this tuft with every appearance of satisfaction and enjoyment.  In this case, and in many others, there can be no doubt that the insects are kept for the sake of food or some other advantage yielded by them.

But there are other instances of insects which haunt ants’ nests, which it is far harder to account for on any hypothesis save that of superstitious veneration.  There is a little weevil that runs about by hundreds in the galleries of English ants, in and out among the free citizens, making itself quite at home in their streets and public places, but as little noticed by the ants themselves as dogs are in our own cities.  Then, again, there is a white woodlouse, something like the common little armadillo, but blind from having lived so long underground, which walks up and down the lanes and alleys of antdom, without ever holding any communication of any sort with its hosts and neighbours.  In neither case has Sir John Lubbock ever seen an ant take the slightest notice of the presence of these strange fellow-lodgers.  ‘One might almost imagine,’ he says, ’that they had the cap of invisibility.’  Yet it is quite clear that the ants deliberately sanction the residence of the weevils and woodlice in their nests, for any unauthorised intruder would immediately be set upon and massacred outright.

Sir John Lubbock suggests that they may perhaps be tolerated as scavengers:  or, again, it is possible that they may prey upon the eggs or larvae of some of the parasites to whose attacks the ants are subject.  In the first case, their use would be similar to that of the wild dogs in Constantinople or the common black John-crow vultures in tropical America:  in the second case, they would be about equivalent to our own cats or to the hedgehog often put in farmhouse kitchens to keep down cockroaches.