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Practice Reading: Fill in the Blanks (Dropdown) ID: #5475 Butterfly 3
Instructions
A  rule  of  thumb  for  distinguishing  butterflies  from  moths  in  this  country  is  to  examine  the  antennae  or  feelers,  although,  when  comparing  Lepidoptera  worldwide,  this  technique  is  not  to  be  relied  on.  Generally,  especially  among  those  native  to  the  UK,  butterflies  have  clubbed  feelers,    moths  can  have  feelers  of  various  kinds  other  than  clubbed.  There  are  moths  that  fly  by  day  and  the  more  brightly  colored  of  them  are  sometimes    for  butterflies,  but  their  feelers  will  distinguish  them.
Variations  within  a  single  species  of  butterfly  often  occur,  and  all  kinds  are    to  vary  in  their  tint  or  markings,  or  sometimes  both.  These  variations  may  at  times  be  so    as  to  be  hardly  noticeable,  but  in  a  fair  proportion,  the  variation  is  quite  striking.  In  such  cases,  unless  the  difference  is  extreme,  it  is  possible  to  track  all  the  intermediate  stages  between  the  ordinary  form  of  a  species  and  its  most  extreme  variety.  The  coloring  on  the  underside  of  a  butterfly  differs  from  that  of  the  upper  side  and  matches,  or    in  with,  its  natural  habitat  to  a  remarkable  degree.  This  is  why,  when  they  settle,  you  can  see  them  with  their  wings  positioned  together  upright  over  their  back.
The  number  of  known  species  of  butterflies  throughout  the  world  has  been  put  at  about  thirteen  thousand  or  more,  but  some  believe  there  are  several  thousand  more  species  as  yet  undiscovered.

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