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A miracle involves investing material things with extraordinary powers , powers that are not typical of their natural kinds . And yet even the brutes do not touch the flesh of their own kind ; and they pair by a law of nature , and only at the regular season , not from simple wantonness ; they also recognise those from whom they receive benefits . I feared what their reaction might be to those not of their own kind . As any waterfowler who has ever hunted near a refuge knows , ducks and geese associate safety with numbers , and they usually flock to the largest concentrations of their own kind . This enabled the vertebrates to take full advantage of their new kind of immunity , adaptive immunity .