title: Border around bars and caterories, ggplot
body: <p>I try to plot a bar plot in ggplot, having as y number of animals per species by  on x the countries. I manage that far, but as I try to outline each species and bar I get the border between each value in the graph. </p>
  
  <p>I also tried using the reprex package to create a nicer looking question including my graphs, but I have too little reputation to post the pictures apparently.  </p>
  
  <p>So I try the code only: </p>
  
  create dataframe
  
  <pre><code>library(tidyverse)
  
  country &lt;- c( "AA", "AA", "BB", "BB", "CC", "CC", "DD", "DD", "EE", "EE")
  sheep &lt;-c(130, 146, 12, 15, 19, 0, 44, 57, 99, 123)
  cattle &lt;- c(11, 34, 221, 0, 91, 49, 33, 28, 19, 10)
  pigs &lt;- c(55, 0, 34, 48, 54, 0, 33, 59, 112, 23)
  
  animals_wide &lt;- data_frame(country, sheep, pigs, cattle)
  </code></pre>
  
  'reshape' the table from wide to long (tidyr::gather)
  
  <pre><code>animals_long &lt;- animals_wide %&gt;%
    gather(key = species, value = numbers, -country)
  
  glimpse(animals_long)
  </code></pre>
  
  plot by ggplot
  
  <pre><code>ggplot(animals_long, aes(country, numbers, fill = species)) +
    geom_bar(stat = "identity") +
    theme(axis.text.x = element_text(angle = 90, hjust = 1)) +
    scale_fill_manual(values=c("gray", "black", "white"))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/whpyh.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/whpyh.jpg" alt="enter image description here"></a></p>
  
  tries to add black outline to 'species' in bar by adding geom_bar(..., colour = "black)
  
  <pre><code>ggplot(animals_long, aes(country, numbers, fill = species)) +
    geom_bar(stat = "identity", color = "black") +
    theme(axis.text.x = element_text(angle = 90, hjust = 1)) +
    scale_fill_manual(values=c("gray", "black", "white"))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/YOsGf.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YOsGf.jpg" alt="enter image description here"></a>
  So, what I would like to achieve is a bar plot with a black border of each of the species. Thanks in advance! </p>