Bug Net

The Bug Net is a tool used to capture Critters as inventory items. It is swung like a sword, but deals no damage. The Bug Net is required in order to go Fishing, as it is the initial and primary method of obtaining Bait: Most Critters that are insects, worms, or snails can function as Bait once captured. The Bug Net is sold by the Merchant for.

Other uses

 * A captured Critter can be combined with a Terrarium to craft a decorative Cage that showcases the animated Critter inside.
 * Captured Critters can also be "used" or dropped, which frees them back into the environment.
 * Captured Goldfish are unique in that they cannot be released as live Critters again once caught, though they can be crafted into a Fish Bowl, which will display them as live animated characters.
 * Captured Bunnies can craft Explosive Bunnies.
 * A captured Truffle Worm can be used to summon Duke Fishron, a Boss, during Hardmode. It must be used as Bait at an Ocean.

Trivia

 * Possibly a reference to the The Legend Of Zelda game series, where Link uses an item called "Bug Net" used to catch critters.