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Message: <blockquote data-quote="Mysticete" data-source="post: 1600978" data-attributes="member: 67784"><p>I wonder how important diagnosability is for defining species though.  Birders have it quite easy, but there are many cryptic mammal and herp species which are only diagnosable by chromosome, teeth, or other hard to access in the field features.  My guess is that the Crossbills forms are not that bad, but just require "in hand" identification.  I would think many seabirds might also run afoul of the diagnosability problem as well (recent suggested Storm Petrel splits are just as scary as the crossbill splits in my opinion).</p></blockquote><p></p>