The Victorian naturalist, Alfred Russell Wallace, during his sojourn through the Archipelago, had much to say of these spikey ants: "The curious spiny ants forming the genus Polyrhachis are very abundant in the whole archipelago, though they never swarm like so many others of the family, and rarely inhabit houses. They seem to be truly arboreal species, and are mostly of a rather large size. Many of them are beautifully sculptured or curiously furrowed; and the fantastically shaped spines with which they are almost all furnished render them very interesting objects for examination... The general characteristics of these ants appear to be, that they live in small communities in exposed situations, and are not very active; while, being of generally large size, they must be very much exposed to the attacks of insectivorous birds and other animals. They have neither sting nor powerful jaws to defend themselves, and, from their limited powers of increase, would seem to be peculiarly liable to extermination, without some special protection. It seems probable that this is the purpose of the curious hooks, spines, and points with which they are armed, and which must no doubt render them unpalatable morsels, very liable to stick in the throats of their captors.
"The great number of species of ants, and the curious modifications found among them, indicate that they have much inherent tendency to variation; and we may well imagine how, in the severe struggle for existence which is for ever going on where life is so abundant and varied as in the tropics, the most widely distinct modifications have been seized upon by "natural selection" as a means of safety and perpetuation. The power of rapid increase, the habit of making subterranean abodes, or of seeking food only at night, the poisonous sting, the powerful jaws, minuteness of size, or the being armed with spiny processes, are all advantages to their possessors; and the first rudimentary appearance of any of these, in however slight a degree, would inevitably lead to their persistence and perpetuation, and to the further development of such peculiarities by the preservation of all favourable and the destruction of all unfavourable variations."
Apparently, these ants also form the key ingredient of certain Chinese tonics, including formulas for raging hot rods. It's a curious trait to ascribe to the selfless foragers of a sterile sisterhood.
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