Four lines, two animals, one confession, and the word the poem is really about never appears in the lines themselves. "Jealousy" sits above the text as a title, and only after reading do we see what it points at. The speaker looks at a moose and a wolf and envies them. The envy is not for strength or speed but for something simpler: they are "free to wander and exist only for today."
The central idea is that awareness of time is both a human gift and a human trap. The animals have a single tense. The speaker lives in two, and neither is the present: she is "yearning for tomorrow" while "trapped in the illusions of yesterday." The poem names all three days, yet the speaker occupies none of them. She is stretched between a past she cannot leave and a future she cannot reach, and the one day the animals own is the one she is missing. Even the order of the words, today, then tomorrow, then yesterday, feels scrambled, as if her mind cannot keep time in a straight line.
The construction quietly supports this. Only the second and fourth lines rhyme, and they rhyme on "today" and "yesterday." The word for the animals' whole world is tied by sound to the word for the speaker's prison. "Yesterday" even has "day" built into its ending, so the past seems to contain the present, and freedom and confinement sit one syllable apart. Because "yesterday" is also the final word, the past gets the last say, and the poem ends exactly where the speaker is stuck.
The rhythm alternates short and long. The first line, "The moose and the wolf," is five syllables. The second runs to fourteen, more than twice as long, and has no punctuation to slow it. Judging by the effect, that sprawling line mimics the wandering it describes. Line three shrinks again to six syllables, and the final line, at eleven, comes back tighter than the freewheeling second line, as though the room to roam has been taken away. The poem is mostly free verse, and the single rhyme feels all the more deliberate for it.
Small choices of language add to the contrast. The first line is a bare subject with no verb, so the animals stand alone for a moment before the second line repeats them as "They." That doubling sounds like speech, as if the speaker were pointing and thinking aloud. Then the formal "They are" gives way to the clipped, intimate "I'm," which sets distance against closeness. "Exist" is a plainer word than "live," and it suits creatures who simply are, with no ambition attached. "Wander" suggests having no destination, which fits beings with no tomorrow to aim at. Meanwhile "illusions" implies that what holds the speaker is not even real. It may be memories polished by longing, or hopes that never came true. A trap made of illusions has no lock to break, which makes it harder to escape.
The imagery moves from the visible to the invisible. The moose and the wolf are concrete, big, wild, easy to picture, and the names suggest forest, open ground and cold air, though the poem never describes a landscape. After them come only abstractions: tomorrow, illusions, yesterday. The poem travels from what can be seen to what exists only in the head, which is where the speaker's trouble lives. The animals are also an odd pair. One is usually prey and the other a predator, yet the poem folds them into a single phrase, as if what they share matters more than what divides them.
What makes the poem significant is how much it does in so little space. It turns a familiar feeling, envying the simplicity of animals, into a small argument about consciousness. It also does not preach. There is no advice to "live in the moment," only an admission that the speaker cannot. One further reading is possible, though the poem never says it. The wolf must hunt and the moose must flee, so their freedom may be less pure than the speaker imagines, and her envy may be one more illusion. If so, the title names the trap as well as the feeling.