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The pangolin conservation project launched to protect pangolins has succeeded at Pench Tiger Reserve and Satpura Tiger Reserve, as the mammals have started to breed there. Pangolins, also known as scaly anteaters, are the only known mammals with large keratin scales covering their skin. It lives in India (south of the Himalayas), Bangladesh, Southern Nepal, Sri Lanka, and small parts of Pakistan.
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What will come in place of the question mark (?) in the following series?
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