*''"I still maintain that '''there is no special difficulty''' in a bear's mouth being enlarged to any degree useful to its changing habits"''<ref name="Darwin's whale"/><ref>{{cite book|author=Darwin, F.; Seward, A.C. |title=More Letters of Charles Darwin |publisher=Appleton |place=New York |volume= 2 |year=1903 |pages=162}}</ref><ref>{{cite book |title=Darwinism: the refutation of a myth |author=Søren Løvtrup |publisher=Croom Helm |year=1987 |pages=87 |isbn=978-0709941538|url=http://books.google.com/books?ei=XSeVUoG4EMLiywP1hoGoDw&hl=sk&id=ByMUAQAAIAAJ&dq=there+is+no+special+difficulty+in+a+bear%27s+mouth&focus=searchwithinvolume&q=being+enlarged}}</ref> | *''"I still maintain that '''there is no special difficulty''' in a bear's mouth being enlarged to any degree useful to its changing habits"''<ref name="Darwin's whale"/><ref>{{cite book|author=Darwin, F.; Seward, A.C. |title=More Letters of Charles Darwin |publisher=Appleton |place=New York |volume= 2 |year=1903 |pages=162}}</ref><ref>{{cite book |title=Darwinism: the refutation of a myth |author=Søren Løvtrup |publisher=Croom Helm |year=1987 |pages=87 |isbn=978-0709941538|url=http://books.google.com/books?ei=XSeVUoG4EMLiywP1hoGoDw&hl=sk&id=ByMUAQAAIAAJ&dq=there+is+no+special+difficulty+in+a+bear%27s+mouth&focus=searchwithinvolume&q=being+enlarged}}</ref> |