Funny assumption by the young scholar.

He said the changes in the muscle cells probably evolved over a long period of time, perhaps as the Himalayas, one of the Earth’s youngest mountain chains, grew and the birds would have had to fly higher and higher.

Graham R Scott doctoral student who studied use of oxygen by high flying geese from Siberia to India over Himalayas makes a quirky assumption that these birds are flying longer than Himalayas are there.In several millions of years they developed the body and systems a little improvement every century or so . it is nothing more than a leap of faith.

There are many more interesting questions like what compulsion these birds have that they need to fly thousands of miles over Himalayas to go to their destination.why they did not chose alternate rout or destination.Is specie's better because of that or natural selection took a path of zero return. Answer to these questions are more important than speculation of this change in millions of years.