Notes
- 1.^ Although evolutionary and developmental constraints preclude the possibility of a wheel as part of an organism, they do not preclude the use of foreign objects as "wheels", either instinctually (as in the case of the dung beetles discussed above), or through intelligently directed tool use (as in human technology).
- 2.^ Wheels can be considered to fall into two types: passive and driven. A passive wheel simply rolls freely over a surface, reducing friction when compared with dragging. A driven wheel is powered, and transmits energy to the surface as a means of generating locomotion.
Read more about this topic: Rolling Animals
Famous quotes containing the word notes:
“A little black thing among the snow
Crying “’weep, ‘weep,” in notes of woe!
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“Of all the horrid, hideous notes of woe,
Sadder than owl-songs or the midnight blast,
Is that portentous phrase, “I told you so,”
Uttered by friends, those prophets of the past.”
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In dying Notes discovers
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Whose Dirge is whisper’d by the warbling LUTE.”
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