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Crickets any one? last sentence huum bug... *LINK*

Evolution and morphology
In addition to the biochemical basis of extraterrestrial life, many have also considered evolution and morphology. Science fiction has often depicted extra-terrestrial life with humanoid and / or reptilian forms. Aliens have often been depicted as having light green or gray skin, with a large head, as well as four limbs - he fundamentally humanoid. Other subjects, such as feline and insects, have also occurred in fictional representations of aliens.

A division has been suggested between universal and parochial (narrowly restricted) characteristics. Universals are features which are thought to have evolved independently more than once on Earth (and thus, presumably, are not too difficult to develop) and are so intrinsically useful that species will inevitably tend towards them. These include flight, sight, photosynthesis and limbs, all of which are thought to have evolved several times here on Earth. There is a huge variety of eyes, for example, and many of these have radically different working schematics and different visual Foci: the visual spectrum, infrared, polarity and echo location. Parochial, however, are essentially arbitrary evolutionary forms. These often have little inherent utility (or at least have a function which can be equally served by dissimilar morphology) and probably will not be replicated. Intelligent aliens could communicate through gestures, deaf as humans do, or by sounds created from structures unrelated to breathing, which happens on Earth when, for instance, cicadas Vibrate their wings, or Crickets rub their legs.

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