Friday, November 25, 2011

#Bird's Missing Finger Mystery Solved

Most vertebrates have five digits on each of their limbs but birds have only three. Scientists have long puzzled over which digits the birds have retained. Are they thumb, index and middle finger or index, middle and ring fingers? Now scientists at Yale have done genomic analysis that reveals that the innermost digit is genetically a thumb but in the position of the index finger. 


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