I have a theory that birds are descended from insects, because:
1/ Insects knew how to fly already (being small, these creatures could take
advantage of the slightest breeze to become and remain airborne.)
2/ The avian lung is more like the insect's system, and remote from those of
dinosaurs/reptiles.
3/ Insects have wings already.
4/ Insects have been around longer.
5/ Insects have shorter generations allowing faster natural selection.



"P van Rijckevorsel" wrote in message
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Archimedes Plutonium schreef
So that is a nice compounding for animals. The compounding of hair into
that of multi-hair which ends up as becoming feathers.

*****
Right, birds and plants with compound leafs are birds of a feather
* * *

So then, since compounding is a ongoing phenomenon for both the Plant
Kingdom as well as the Animal Kingdom that we must ask the question as
to what is the source of this tendency to compound within biological
kingdoms.

*****
Energy efficiency
* * *

Darwin Evolution would spring in to say that the source for the tendency
or proclivity to compound in Nature is due to the fact that DNA is
itself a compound symmetry for it is not a single helix but a double
helix.

*****
Darwin did not know about DNA and certainly had nothing to say about it
* * *

So life on Earth in a million years hence in the future, if it survives
will have compounded in ways hardly imagineable to us today.

*****
Evolution moves slowly, but who knows how the influence of Man wiil work
out
* * *