Add a list of birds specified in YAML front matter to your Jekyll post.

gistfile1.liquid

# Place this in your _posts.html layout.
# Add birds to your post in YAML front matter.
# e.g.
#         birds:
#           - Roc
#           - Phoenix
#           - Thunderbird
# or
# 
#         birds: [Roc, Phoenix, Thunderbird]
#         
# classes .birdlist and .birdstring are provided for styling.

<div class="birdlist">
  {% if page.birds %}
  <hr>
  <h3>Birds in this entry:</h3>
    <div class="birdstring">
    {% assign birdies = page.birds | sort %}
    {% for birdy in birdies %}
      {% unless birdy == birdies.last %}
      {{ birdy }}, 
      {% endunless %} 
    {% endfor %}
    {% if birdies.size > 1 %}
    and 
    {% endif %} 
    {{ birdies.last }}.
    </div>
  {% endif %}
</div>