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B
Swallowing
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C
Sucking
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D
Biting
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Solution
The correct option is B Sucking
Birds take nectar by sucking it from the flowers. Birds that suck have slender, curved bills whose tongue are long and slender. When bird pokes its bills into the flower and extends its tongue, the straw-like tip will automatically take up some of the nectar through capillary action. So, the correct answer is 'Sucking'.