http://ornithology.com/Lectures/RespirandCircul.html
http://www.sciencedirect.com/science/ar ... 319401962G
http://link.springer.com/article/10.1007%2FBF00702734
http://home1.gte.net/impekabl/Birdflight.html
http://www.researchgate.net/publication ... separately
http://rstb.royalsocietypublishing.org/ ... /1496.full
http://www.sciencedaily.com/releases/20 ... 212222.htm
http://www.sciencedaily.com/releases/20 ... 110931.htm
http://www.nature.com/news/2011/110325/ ... 1.187.html
http://www.tci-thaijo.org/index.php/tjv ... iew/9647/0
http://www.ncbi.nlm.nih.gov/pubmed/19822131
http://idea.ucr.edu/documents/flash/ant ... /story.htm
http://www.psycheducation.org/mechanism ... 0intro.htm
http://www.sciencedaily.com/releases/20 ... 084509.htm
http://www.abcbirds.org/newsandreports/ ... 30513.html
http://ontario-wind-resistance.org/2014 ... ish-study/
http://www.poulvet.com/poultry/articles/physiology.php
http://www.redorbit.com/news/science/19 ... ne_levels/