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Mononykus sex

Some adaptations may only be used once or twice in the life of an animal, but
if they involve reproduction they will be selected for.  Consider the
vestigial arms of _Mononykus_, which are apparently only good at grappling
something about as big around as its own trunk diameter and holding it close
to its own chest -- like another _Mononykus_ perhaps?? If mating required any
length of time, or if courtship involved considerable grappling, that would
explain the big claws (to dig in through the feathers) and the big olecranon.
Yes or no?

David Peters