so basically they need a well defined 'stop'. this term's used in dogs to explain where the top of the muzzle meets the skull. it would seem to apply to birds too, where the top edge of the beak/nares/skull meet, should not be a straight line.The more I try to understand "deep" and "fairly full of skull", I do think that they are intended to be the opposite of crow head. The one thing that I noticed, when I went back to Cochins International and studied photos on the Show Results page, is that the winners all have "foreheads" - if that makes sense. Foreheads that appear more upright, rather than slanted toward the top of the head like a crow head. Let me know if you all notice that as well.