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von Uexküll, J. (1992). A stroll through the worlds of animals and men: A picture book of invisible worlds. Semiotica, 89(4), 319–391.   
Added by: Mark Grimshaw-Aagaard   Last edited by: Mark Grimshaw-Aagaard 10/31/23, 6:13 PM
"A vineyard snail is placed on a rubber ball which, carried by water, slides under it without friction. The snail's shell is held in place by a bracket. Thus the snail, unhampered in its crawling movements, remains in the same place. If a small stick is then moved up to its foot, the snail will climb up on it. If the snail is given one to three taps with the stick each second, it will turn away, but if four or more taps are administered per second, it will begin to climb onto the stick. In the snail's world a rod that oscillates four times per second has become stationary. We may infer from this that the snail's receptor time moves at a tempo of three to four moments per second. As a result, all motor processes in the snail's world occur much faster than in ours."

"According to information I have received concerning the sound perception of night moths, it makes no difference whether the sound to which the animals are adjusted be the sound manifestation of a bat or one produced by rubbing a glass stopper — the effect is always the same. Night moths which, owing to their light coloring, are easily visible, fly away upon perceiving a high tone, while species which have protective coloration alight in response to the same tone. The same sensory cue has the opposite effect in their case. It is striking how the two opposite kinds of action are governed by a plan. There can be no question of discrimination or purposiveness, since no moth or butterfly has ever seen the color of its own skin. The plan revealed in this instance appears even more admirable when we learn that the artful microscopic structure of the night moth's hearing organ exists solely for this one high tone of the bat. To all else, these moths are totally deaf."