Derpling

Derpling spawns on the surface Jungle during the daytime when Hardmode is activated in place of the Giant Flying Foxes that spawn at night. This bug-like monster jumps high and attempts to land on you. It can strafe to the sides in midair, making it a pain to deal with. One is advised to deal with them quickly, as they spawn fast and can easily overwhelm you.

They are immune to the Confused debuff.

Trivia

 * The Herpling is considered somewhat of a counterpart to the Derpling.

Tips

 * Using a weapon with a long reach (i.e Fiery Greatsword) allows you to keep these monsters away. Having an item to increase knockback can also be helpful.
 * Ranged weaponry is a good idea, especially in early hardmode, as they can deal a lot of melee damage very quickly, particularly to less well equipped players.
 * Spears are some of the best weapons to use for their long reach and high rate of damage, which can stun-lock them.