Rider of the Deep

"The Rider of the Deep has emerged."

The Rider of the Deep is an Sea Creature that can be fished up from Water.

Spawning
The Rider of the Deep is an Sea Creature that requires  (11) to be fished up. The base chance for a caught Sea Creature to be a Rider of the Deep is. It takes the appearance of a Chicken Jockey wearing Chainmail Armor.

Trivia

 * Prior to version 0.9, the chicken could lay eggs that gave XP like a normal chicken.
 * If the player kills only the chicken or the rider, and not the other, they only receive the drops from that mob. If the player kills both the chicken and the rider at the same time with a weapon like the Ink Wand, they receive the drops for both mobs. It is unknown if this is a glitch or an intended feature.
 * Prior to a fix, the Fishing XP from killing the Monster of the Deep counted towards the XP required to spawn Revenants even though the message from starting a Zombie Slayer quest specifies that Combat XP is required.