There are certain channels of communication that operate outside the frequencies of the most prying investigators. A hundred blackbirds will evacuate a tree at precisely the same second—without a discernible signal of any kind. A variety of orchid, lacking nectar as an enticement but needing to be pollinated, attracts male bees by emitting odors like that of the female bee. A wasp will bore for an hour into the hard wood of a tree at the exact spot where hides the tiny grub in whose body she lays her eggs: there is no outward sign that the grub is there, yet the wasp never misses. At the
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