[[Image:Ventral curve donkey.jpg|right|thumb|200px|<small><center>Normal ventral curve (Image courtesy of [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]] | [[Image:Ventral curve donkey.jpg|right|thumb|200px|<small><center>Normal ventral curve (Image courtesy of [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]] |