Ted Hughes' poem "Mooses" compares antlers to thoughts in the second stanza.
With massy bony thoughts sticking out near his ears –
Reaching out palm upwards, to catch whatever might be
falling from heaven –
This is a metaphor because the narrator compares them without using "like" or "as." Try replacing the word "thoughts" with the word "antlers," and you will see that the sentence still makes sense!
This is an effective metaphor because the antlers are a part of the head of a moose, just as we associate thoughts with our heads.
The poem also portrays Moose as being "goofy" sorts of creatures.
Hopeless drops drip from his droopy lips.
The other Moose just stands there doing the same.
Two dopes of the deep woods.
The metaphor of thoughts to antlers furthers that theme because Moose are "blundering," and thus have big antlers sticking out from their heads that always get in the way. Thoughts are the same, as they always get in the way of humans, and could also be characterized as "blundering."
Hope this helps!