The answer to this question is hidden within the question
itself. How so? Well, first we need to be aware of what
satire is. What is satire? Satire is when an author pokes fun of (almost
mockingly) the element of a government that the author deems a flaw, failure,
or weakness. It doesn’t necessarily need
to be humorous because humor is subjective, and so for every 10 people who find
something funny, there are 10 other people who find the same thing not
funny. As such, satire is best determined
to be scorn. That said, because we know
satire is scorn for the government, the question is almost self answering in
that satire exists within “Top of the Food Chain” because of how he scorns the
government.
"Wider still, and wider, shall thy bounds be set;" if this refers to the British Empire I believe it means that it is commenting on the expanding boundaries of this Empire as new lands are conquered and turned into colonies. At one time, Britain had far flung colonies in Africa, Asia and also the 13 colonies and Canada before the independence movements of the late 18th century in America and also 20th century in Africa. In other words, at one time the world was colonized by primarily the Spanish, the Portuguese and the British and the colonies had to supply the raw materials to the colonizers and were an appendage of the big powers.
