"Beware the Jabberwock, my son!
      The jaws that bite, the claws that catch!
Beware the Jubjub bird, and shun
      The frumious Bandersnatch!"

The JubJub Bird

The elusive JubJub bird is very briefly referred to in Lewis Carroll's 'Jabberwocky' poem, but is described in detail by the Butcher in 'The Hunting of the Snark (An Agony in 8 Fits)':

"Be a man!" said the Bellman in wrath, as he heard
   The Butcher beginning to sob.
"Should we meet with a Jubjub, that desperate bird,
   We shall need all our strength for the job!"

"Then a scream, shrill and high, rent the shuddering sky,
   And they knew that some danger was near:
The Beaver turned pale to the tip of its tail,
   And even the Butcher felt queer.

He thought of his childhood, left far far behind—
   That blissful and innocent state—
The sound so exactly recalled to his mind
   A pencil that squeaks on a slate!

"'Tis the voice of the Jubjub!" he suddenly cried.
   (This man, that they used to call "Dunce.")
"As the Bellman would tell you," he added with pride,
   "I have uttered that sentiment once.

"'Tis the note of the Jubjub! Keep count, I entreat;
   You will find I have told it you twice.
Tis the song of the Jubjub! The proof is complete,
   If only I've stated it thrice."

"As to temper the Jubjub's a desperate bird,
   Since it lives in perpetual passion:
Its taste in costume is entirely absurd—
   It is ages ahead of the fashion:

"But it knows any friend it has met once before:
   It never will look at a bribe:
And in charity-meetings it stands at the door,
   And collects—though it does not subscribe.

"Its flavour when cooked is more exquisite far
   Than mutton, or oysters, or eggs:
(Some think it keeps best in an ivory jar,
   And some, in mahogany kegs:)

"You boil it in sawdust: you salt it in glue:
   You condense it with locusts and tape:
Still keeping one principal object in view—
   To preserve its symmetrical shape."

The Butcher would gladly have talked till next day,
   But he felt that the Lesson must end,
And he wept with delight in attempting to say
   He considered the Beaver his friend.

While the Beaver confessed, with affectionate looks
   More eloquent even than tears,
It had learned in ten minutes far more than all books
   Would have taught it in seventy years.

They returned hand-in-hand, and the Bellman, unmanned
   (For a moment) with noble emotion,
Said "This amply repays all the wearisome days
   We have spent on the billowy ocean!"

Such friends, as the Beaver and Butcher became,
   Have seldom if ever been known;
In winter or summer, 'twas always the same—
   You could never meet either alone.

And when quarrels arose—as one frequently finds
   Quarrels will, spite of every endeavour—
The song of the Jubjub recurred to their minds,
   And cemented their friendship for ever!