I may have lured that Mockingbird too far down the chimney. Outdoors, I like to try to get Mockingbirds to whistle the two-tone call that our mother used to use to summon us: whee-whoo, whee-whoo. It is so cute when they try to repeat it and especially when they get it right and incorporate it into their repertoire.
The bird in question still sits on top of the chimney and sings. We hear him clearly. I used to sit near the fireplace and tried to teach him to whistle the call. He may have tried to reach that rival bird and fallen down to the point where flying back became impossible.
I promise that I will only whistle at Mockingbirds outdoors, from now on. Fool me once . . .