<p>At a clinic in Denmark on September 9, vets were presented with a rare sight: a two-headed tortoise, just one day old. The animal’s condition is known as Polycephaly and occurs when identical twins fail to separate before birth. Tortoises with this condition <a class="link" rel="nofollow" target="_blank" href="http://metro.co.uk/2010/11/09/chinese-tortoise-born-with-two-heads-575518/" target="_blank">are said</a> to be able to survive without difficulty. This video shows the young tortoise peek one head out of its shell, then the second. Credit: YouTube/Beth Fledelius</p>