Hark! the new-born lambs are bleating, And the cawing rooks are meeting the elms a noisy crowd; All the birds are singing loud, And the first white butterfly In the sunshine dances by. Look around thee, look around! Flowers in all the fields abound: Every running stream is bright; All the orchard trees are white, And each small and waving shoot Promises sweet flowers and fruit. Which characteristic of the passage shows that this is a poem?