Thanks or your comments especially the "grin" expression as this is what I like best.
In all honesty it was caused by the act that it was calling for its "missing" brother, a sound that it was a privllege to hear. Luckily my wife Helena captured the sound on her camcorder.
Just checked but I have nore with more "open" eyes, but whilst looking I found another Cheetah, which I had missed befor, thanks or that
I'll post later in the week, as following your Agama posting I went looking in my very untidy "database" and found an "oldie but goldie" that I will post today.