Bruno rejected[374] the popular notion that the behaviour of ants, spiders, and other animals does not spring from their proper foresight and artifice, but from divine, unerring intelligence acting upon them from without, giving them those "_thrusts_" (_spinte_) which are called "natural instincts"--a term which he regarded as meaningless. "Is this 'natural instinct' sense or intellect? If the former, is it internal or external? Clearly it is not external; but if internal, where is the internal sense from which they could have their foresight, their arts and artifices, their precautions, expeditions, to meet various conditions, both present and future? There must be some proximate principle, _i.e._ a form of _intelligence_ peculiar to each animal, which determines its actions. The divine and universal intelligence is merely the principle that _gives_ it intelligence, through which it understands."[375] The action of animals of a given kind were supposed to be after one perfect model, and to be undeliberate. Bruno therefore placed their intelligence higher than that of man, nearer the level of that of the world-souls. "The swallow makes its nest, the ants their cave, the spiders their web or nets, in one way only, than which they could not make them more admirably or suitably.... Who knows whether the spirit of man is rising upwards, that of others moving downwards? At least it is to be referred to a defect of light and divine force that men hesitate and deliberate in all that belongs to the means of life, the modes of worship and defence, for if all knew perfectly, all would be governed in the best, and consequently in one way only." It is, then, on the analogy of these supposed higher, unerring faculties of animals that Bruno considers the souls of the worlds to think and act. They have perfect freedom, since their life and soul are their own, not borrowed, as ours. "Thus as we breathe, see, sleep, without labour or anxiety, and while our soul performs the function of life, the vital humours and spirits continually circulate, so these, the chief members of the world, divine animals, have no need to undergo any anxious toil, for all things with them are done for the best." Their fixed aim of life defines for them certain determinate orbits, "in which they move freely by the force of that soul which is much more certainly present in these high, perfect, divine bodies than in us, of more ignoble condition, who draw from them spirit and body, come forth living out of their bosom, are nourished by them, and at length are dissolved and received back into them."[376]