As dusk falls in the temperate woodlands and the moths and night-active flies take to the air the insectivorous bats appear to feed on them. Bats have proved so successful in their shape and lifestyle that in most parts of the world they have remained remarkably stable in shape and form ever since they first appeared back in the Middle Paleogene (Early Eocene epoch, or Ypresian). Save for the development of a more sophisticated echolocation system, positioned at the front of the face and the absence of eyes in many species, little else has changed.
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