Which organ is working in birds but vestigial in humans??

1.	Which organ is working in birds but vestigial in humans??
Answer» \tVestigial organ is an organ that has no use in the present, but suggests evolution of the species.\tThe human has a vestigial organ called appendix, not present in birds.\tThere are other vestigial organs like thymus, pineal gland and tonsils.\tThese are essential in suggesting human evolution has taken place.\xa0 May be Appendix but not sure I think wings ...not sure.....

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