@wolfgang59 saidArchaeopteRYX, of course. I've had that word in my head for decades, along with ornithorynchus and pterygium. Must be something about RY that sticks in my brain.
Nobody got your RYX!
RYX
DNA - an Australian animal.
@wolfgang59 said{it could have been BUNYIP}
yippee ? (I doubt that is what you had in mind!)
RAK
RAKe
WAM - a landscape feature