Here is the quote I alluded to earlier:
"Another thing, is one justified in concluding that the way an animal uses its body today is the only possible way? As an example, a tiger uses its fangs and claws to catch, kill and tear apart other animals. Yet, could not these same fangs and claws be used in tearing apart heavy vegetation and ripping off husks and shells?" Watchtower 1969 Sep 1 p.543
(Thanks JWFacts.com)