Cattle Tyrant (<i><a href="//commons.wikimedia.org/wiki/Machetornis_rixosa" title="Machetornis rixosa">Machetornis rixosa</a></i>) on horse, where it is likely feeding on parasites (Asuncion Bay, Paraguay)
Andrea Grosse , NBII
2005-04-26
<a rel="nofollow" class="external free" href="http://images.nbii.gov/details.php?id=18692&amp;cat=Birds">http://images.nbii.gov/details.php?id=18692&amp;cat=Birds</a>