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the subject is unguals...

Which living animals have such loosely articulated digits (and sufficiently 
long at that), that they would impress the lateral or medial sides of their 
large unguals into the substrate? And what makes such looseness possible?

David Peters

PS apologies to D. Pigdon. Evidently I touched a "button." Dan, in your list, 
you can add: 1) libraries and interlibrary loans; 2) borrowing from colleagues; 
3) hoping for an internet post; and 4) visiting the source material. Asking the 
author was probably the best choice. Thanks for the advice.