Can I say,

(a) The owl hunts a mouse at night.

(b) The owl hunts for the mouse in the night.

The owl hunts mice at night.
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Thanks, but the dictionary tole me that,

Hunt always goes with "for" followed by the object, what do you think?

Eg. The owls hunt for food.
Throw away the dictionary.

Hunts mice = mice are its prey
Hunts for mice = searches for mice