Hummingbirds are “high performance” flying machines. Let’s take a look at the stats. According to one birding website, “25-30 percent of a hummingbird’s weight is in its pectoral muscles, the muscles principally responsible for flight.” Their average heart rate is more than “1,200 beats per minute” and at rest, “a hummingbird takes an average of 250 breaths per minute.” So I wonder, what fuels this “high performance” flyer? Do hummingbirds seek out high-octane premium nectar, or can they make do with unleaded “regular”? And if they’re searching for high-octane, how do they find it?