12-day-old chicks with clinical vitamin deficiency at Day 11 (<a href="//commons.wikimedia.org/wiki/File:Mancance_vitamenes_trope_poyons_11djo%C3%BBs.jpg" title="File:Mancance vitamenes trope poyons 11djoûs.jpg">see here</a>), having recovered after injection of a vitamin preparation
<a href="//commons.wikimedia.org/wiki/User:Lucyin" title="User:Lucyin">Lucyin</a>
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<span class="int-own-work" lang="en">Own work</span>