Thought I'd get back into puzzle-making by giving Fortnightly Topic Challenge #22 a go.
As you work through one of your countless puzzle books, you find a sheet of paper inside with a poem on it. It's been a while, you think – almost a year in fact. You suppose your brother was just too busy chasing down his dreams to be trying to vex the puzzle addict that you are. Is this some sort of twisted Christmas present? You take a closer look...
On the surface, the world seems to give you a choice:
Take the head of an ostrich? A grasshopper's tail?
Maybe eggs of a fish left beheaded on sale!
Is that wonder I hear coming from your posh voice?
But beneath the appearance, it looks to you old:
There you see a hyena's true heart on the ground,
With a donkey's hind feet lying back and around,
And the murmured assent is unstarted, untold.
At its core, though, there lies a most wonderful street
Where the secrets of Burgess's Toad are revealed,
And the wings of a swift are high over the field;
Just a second of time makes it all but complete.
What is your brother trying to tell you?
Note: don't read the poem too closely; a good number of words (especially rhyming words) are there only for the rhyme/meter.