Kleinman is evidently unwilling or unable to answer such questions.
(They do involve biology, after all.) But inferences are possible.
In <
https://groups.google.com/group/talk.origins/msg/ac58a8bdd8842e87?
hl=en>
he stated "all birds share at least two common ancestors, a mama and a
papa."
The plain meaning of this claim is that all birds have the same two
parents. So we can begin with:
Kleinman's Model of Avian Reproduction
Somewhere, there is a _humongous_ nest with two birds. (Storks,
presumably, nesting atop the chimney of Santa Claus's house.) The mama
bird spends all her time laying eggs while the papa bird flies all
over the world delivering the eggs to good little birdies everywhere.
And that's where baby birds come from.
Of course, that fails to answer the question of how birds first arose.
Fortunately, simple logic might suffice.
Kleinman's Theorem of Avian Origins
(A) All birds are descended from other birds. (Possibly Mama and Papa
Stork, as above. But anyway certainly not from any non-bird ancestor!)
(B) Birds currently exist. (Maybe someone pointed to a winged
feathered critter once and said "Look Alan! A birdie!" And that's all
he needs to know about ornithology.)
Therefore:
(C) Birds have always existed. There was no time when birds did not
exist. Hence the question of where birds as a group came from is
meaningless. All mathematical and empirical evidence (*) agrees with
this conclusion.
(*) By "all mathematical and empirical evidence", Kleinman means
anything he can misinterpret as supporting his opinion. He either
ignores or chooses to remain ignorant about everything else.