title: Delete certain data from ggplot
body: <p>I am making a plot mapping species abundance (count) by year, with each species being a different color. There are some species with no data or insignificant data that I am trying to get rid of. So far I have this:</p>
  
  <pre><code> ggplot(data = df, mapping = aes(x = Year, y = Count,
                                   color = Species)) + geom_line() 
  </code></pre>
  
  <p>The graph is exactly what I want, but I can't figure out how to remove a species' data from the graph so it looks a little cleaner.</p>
  
  <p>This is what the data looks like:</p>
  
  <pre><code>  Year   Species      Count
  1 1992 American Toad     2
  2 1993 American Toad    12
  3 1994 American Toad    13
  4 1995 American Toad   120
  5 1996 American Toad   144
  6 1997 American Toad    82
  </code></pre>