6 ms·
Look at birds. Bird lungs aren't actually continuously-pumping, but are a relatively small step away from being so.
by TheLoneWolfling 11y ago
Look at birds. Bird lungs aren't actually continuously-pumping, but are a relatively small step away from being so.
- digi_owl 11y agoThis? http://www.peteducation.com/article.cfm?c=15+1829&aid=2721 http://www.peteducation.com/article.cfm?c=15+1829&aid=2721 TIL that birds are natures four stroke engines...