TBTL Ten Dana sent over a tip on a Marsupial Gurgle-like sound that Andrew made back on TBTL #1209 at around the 6m 19s mark.
MP3 | MPEG-4 | MPEG-4 Ringtone
Although it doesn’t exactly has the same punch or uniqueness of the current day Marsupial Gurgle sound, it is along the same lines and thus been named the “Proto Marsupial Gurgle”.