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Copied from XI wiki:

When the Beastmaster Job Ability "Call Beast" was added with the Rise of the Zilart expansion, many of its Jug Pets (excluding the CoP ones) were added in the April 2003 update. Five Jug Pets, however, have sat idle in the game's files, unable to be crafted because they lack recipes. To date, they have not been added, nor does it appear there are any plans for them to be added. They are:

Lucky Lulush (Rabbit, possibly of another color)- Lucky Carrot Broth (Lv23)
Coeurl Familiar (Coeurl)- Brain Broth (Lv38)
Fatso Fargann (Leech)- Foul Blood Broth (Lv43)
Swift Sieghard (Slime or Hecteyes)- Mellow Bird Broth (Lv53)
Crafty Clyvonne (Coeurl)- Cunning Brain Broth (LV63)
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It's too bad really. I would love to have more jug pets around, especially Coeurls and Slimes, that'd be so useful without being game breaking overpowered in my opinion.