Which Jatakas illustrate Viriya Paramita As far as I know, the story of Khantivadi illustrates the perfection of Khanti by the Bodhisatta, and the Vessantara Jataka illustrates the perfection of Dana - on similar lines - is there a Jataka(s) which illustrates the perfection of Viriya in the Pali Canon ? 
Also , Could anyone point out references to other articles/suttas/commentaries etc. inside/outside the Pali Canon on the topic of Viriya Paramita and its cultivation ?
The commentary cites the Maha-Janaka Jataka (539) as the pinnacle of the perfection of effort:

So I will ever do my best to fight through ocean to the shore;
While strength holds out I still will strive, nor yield till I can strive no more.&quot;
(Cowell, trans)

Also, the Vaṇṇupatha Jataka (#2) deals with this perfection. There's also one about a bird trying to put out a forest fire that comes to mind, but can't find it right now.