..."Other clues suggest that both Agkistrodon and Trimeresurus (Bothrops) moved from Asia to America, one of these presumably giving rise to the rattlesnakes... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The huge,distinctly box-shaped head and the position of the singleblowhole to the left front of the head are unmistakable clues...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...Kell seemed unableto furnish clues of any value, butofficials are not entirely satisfiedwith the man’s attitude toward thequestions...
Various 「Astounding Stories of Super-Science, March 1930」
...The aborigines generally either feignedignorance of the nature of the country, or gave only false clues andmisguiding directions...
Ernest Favenc 「The Explorers of Australia and their Life-work」
...This naturally led to a most unsatisfactory inspection of the countrytraversed, and it was impossible to say what clues to water were passedby unwittingly...
Ernest Favenc 「The Explorers of Australia and their Life-work」
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