Rufous piculet: lateral aspect of head (left) and dorsal aspect of tail (right)
Peter Smit (artist), Edward Hargitt (text)
<i><a href="//commons.wikimedia.org/wiki/Catalogue_of_the_birds_in_the_British_Museum" title="Catalogue of the birds in the British Museum">Catalogue of the birds in the British Museum</a></i> (<a rel="nofollow" class="external text" href="https://archive.org/details/catalogueofbirds18brit">Vol. 18</a> Page 554)