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Correct Option is An extinct bird with an extra-long toe.

Elektorornis chenguangi – an extinct bird with an extra-long toe – has been described in a study published in the journal Current Biology. In 2014 the fossil of Elektorornis chenguangi – a small bird which lived 99 million years ago, with a weird elongated toe – were discovered in Myanmar’s Hukawng Valley. The preserved toe measures less than half an inch from knuckle to claw-tip, making it 41% longer than the next longest digit on the creature’s foot. Its elongated toe structure has never been observed in other birds, living or extinct. Elektorornis chenguangi may have used the long, sensitive digit to probe cracks in trees for insects and grubs.

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