Two short statements, each of them a transformation. The speaker says "I am an owl," then a bear, as if slipping into different animal skins. What's interesting is the parentheses. Each claim gets a quiet aside that tells us what the animal is actually doing. The owl "calls my name," which is a neat twist: the owl's hoot becomes the speaker's own name, so the cry of the animal and the identity of the person blur together. The bear is all appetite, "so much pursuing / of a tangier supper," a restless search for something with more flavor than the last meal.
The speaker seems to feel both playful and hungry. There's a sense of longing in the owl's calling, a voice sent out in the dark, and a more physical, hungry drive in the bear. The mood is spare, mysterious and a little humorous. The poem suggests that a self isn't fixed, and that we might find ourselves in the creatures we imagine.