When hit with a Boomerang-type weapon, each one will fly back a long distance making these weapons ideal when trying to escape, but it is not recommended when attempting to fight in an enclosed area as they will bounce off the walls and come back quickly for more damage. The player could be knocked off of a small platform or pushed into nearby enemies in this manner. The Minishark is very effective against them.
If caught on a player built tower, be wary, because they shoot stingers at you, and can knock you off, disrupting the activity you were doing, and, if at a low enough level, disrupt your life.
If spawned with server commands, the hornets will be aggressive the player who spawned it until he/she is dead. After that, the hornets will start to be aggressive to other players. As of 1.1.1, only the Hornet Family is known to have this behaviour.