What is a poem that has to do with "the will to survive", savagery, etc. (Life of Pi themes)?

Question

The poem should be decently long and be a known author.

Answer 1

These are the lyrics of Survivor's 'Eye of the Tiger':

Risin' up, back on the street

Did my time, took my chances

Went the distance, now I'm back on my feet

Just a man and his will to survive

So many times, it happens too fast

You change your passion for glory

Don't lose your grip on the dreams of the past

You must fight just to keep them alive

It's the eye of the tiger, it's the cream of the fight

Risin' up to the challenge of our rival

And the last known survivor stalks his prey in the night

And he's watchin' us all in the eye of the tiger

Face to face, out in the heat

Hangin' tough, stayin' hungry

They stack the odds 'til we take to the street

For we kill with the skill to survive

It's the eye of the tiger, it's the cream of the fight

Risin' up to the challenge of our rival

And the last known survivor stalks his prey in the night

And he's watchin' us all in the eye of the tiger

Risin' up, straight to the top

Have the guts, got the glory

Went the distance, now I'm not gonna stop

Just a man and his will to survive

The eye of the Tiger...