The second small picture of Heracles Antonio Pollaiuolo painted for Lorenzo il Magnifico, of equal height, fighting the lion, seems to be lost completely. Heracles fighting the Hydra is in the Uffizi, and even in better condition than Antaeus. Vasari writes about it:
The third picture, wherein Hercules is slaying the Hydra, is something truly marvellous, particularly the serpent, which he made so lively and so natural in coloring that nothing could be made more lifelike. In that beast are seen venom, fire, ferocity, rage, and such vivacity, that he deserves to be celebrated and to be closely imitated in this by all good craftsmen.