Based on the clue 'because they were too inexperienced or low in rank...', what is the answer?

Based on the clue 'because they fit one inside the other russian matr...', what is the answer? Based on the clue 'because they have this quality cats claws dont get...', what is the answer? Based on the clue 'because they often prodded cattle with sticks cowb...', what is the answer? Based on the clue 'because they squeeze their prey to death boas pyt...', what is the answer? Based on the clue 'because theyre less valuable than rubies diamonds...', what is the answer? Based on the clue 'because theyre most active after dark opossums are...', what is the answer? Based on the clue 'because this black bird eats a wide range of agric...', what is the answer? Based on the clue 'because this cat from the isle of man has hind leg...', what is the answer?