I would have interpreted the third horn as ears.<p>Two hypothesis on the six legs:<p>* an oddity, this things sometimes happen and might have been interpreted as good or bad omens, worth recording. The positioning (mid-flank rather than at the bottom, like the others) seems consistent with similar cases I have seen.
Random internet result: <a href="http:&#x2F;&#x2F;www.huffingtonpost.com&#x2F;2012&#x2F;01&#x2F;25&#x2F;6-legged-lamb_n_1232176.html#gallery&#x2F;22942&#x2F;0" rel="nofollow">http:&#x2F;&#x2F;www.huffingtonpost.com&#x2F;2012&#x2F;01&#x2F;25&#x2F;6-legged-lamb_n_123...</a><p>* maybe those are not extra legs of the top animal, but horns of the bottom animal (who also has 4 short legs), maybe recording when some ram or species of deer charged into a much larger cow? Though the horns would be out of proportion, and I&#x27;d expect them to be curved.