Box Elder News Journal | 1911-05-18 | Page 7 | Adapted for High Altitude

adapted for high attitude altitude it Is a familiar fact that living at al high altitude puts a strain on tile heart which has more work to do 10 in this connection says knowledge it Is interesting to notice Sl St recent comparison of 0 ptarmigan from high altitudes and willow grouse grous from efrom the plains ile he found that in gan even iri id the young bird the right ventricle of the heart is very distinctly Et stronger ronger than in the tha willow grouse a specific adaptation to the difference of 0 habitat