Ssslumber

"Thought you steal Ssslumber's gold while he slept did you? But I heard you coming, clumsy bear"

- Ssslumber

Ssslumber is an enormous, albeit rather lethargic, green rattlesnake with a keen sense of hearing found in Mayahem Temple, specifically in the Jade Snake Grove, which it aptly named after him. He is constantly sleeping, and only awakens when he hears someone attemping to steal his Jiggy, which he vigilantly guards on top of the Code Room pyramid where he resides. He cleverly surrounds his Jiggy with a mat of loose twigs which will snap underfoot, alerting him to any would-be thieves.

Only by climbing up onto a small twig-less portion of the ground and then tiptoeing by pushing very lightly  as they walk across the branches  can Banjo and Kazooie sneak up on Ssslumber and grab the Jiggy without waking him.

Alternatly, Ssslumber's Jiggy can also been gotten with a well-placed Clockwork Kazooie Egg

Trivia

 * Interestingly, after Banjo and Kazooie have collected his Jiggy, Ssslumber will not wake up again, regardless of how much noise they make on the branches.
 * Ssslumber's name is a pun on slumber (in reference to his tendancy to sleep), spelled with two extra s's to emulate a hissing sound.