Bob
Thanks for the fascinating post on the various polecat species.
 
A question: What are the criteria for deciding if two animals are the
same species, separate species or sub-species?
 
I remember in the good old days when the major criterion was the ability
to reproduce fertile offspring, but that seemed to combine too many
species together.  I know with the advent of DNA technology, that has
become a major tool.
 
I imagine that researchers from different fields of study may have
different criteria, genetic, behavioral, etc.
 
Can you clarify this for us?
 
Linda
[Posted in FML issue 4568]