You know, this always annoyed me.
The aurumvorax, the vegepygmies, the tri-flower frond, the froghemoth, the webbirds, and all sorts of other creatures were published in S3: Expedition to the Barrier Peaks.
In other words, they're from a freakin' other planet. Several other planets, in fact.
To my mind, this made them unique creatures - not ones found in the default Greyhawk/FR planetary ecosystem. But nooooooo... TSR just had to dump them in the MMII.
I know you're allowed to do whatever you want with your own campaign - but I wanted to get this off my chest. Especially if anyone else out there agreed with me.