How do 'denizens' and 'chivalric' add to our understanding of the tiger's attitudes?

Explanation

Animals naturalised in a region or the inhabitants of a particular region are called denizens. Since the natural habitat of the tigers is forest, the poet has correctly defined it as 'denizens of a world of green'. Tigers are characteristically masters of their own domain.
The poet also refers to the tiger as being 'chivalric'. The exceptional heroic courage when facing danger is termed as chivalry. To explain this, the poet goes on to say that the tigers were not afraid of the men standing under a tree and went on prancing with 'certainty'. Since tigers are brave, ferocious and gallant creatures, the poet has used the term 'chivalric'.