High-Elevation Hummingbirds Evolved a Temperature Trick
A humming birds of your garden, you've no doubt seen it flipped from flower to flower hovering midair as it sips on nectar that activity requires plenty of energy. So hummingbirds need a lot of nectar to feed their hungry metabolism's some of them probably drink two or three times. The Body Mass Index Everyday Andrew McCartney an ornithologist at the University of Pretoria in south. Africa. mckanie and his colleagues have studied hummingbirds extreme. In the Peruvian Andes to survive, they're the tiny birds have developed a few tricks for one their blood cells are unusually efficient at transporting oxygen. It's more difficult to hover in the high altitude thin air, and so the humming birds at the higher elevations much prone to pushing while they feed. So that does seem to be one way in which try and reduce the energy expenditure. Now, Macaque Nana's colleagues have found another energy-saving adaptation. The High Mountain hummingbirds can lower their body temperature by extreme amounts of night going into a state called torpor. tencent appearances, they essentially did they. That's unresponsive. The scientists caught six species of Andy and hummingbirds and monitor their temperatures throughout night and day, and they found that all six species could enter some type torpor. They lower their body temperatures from about one hundred degrees Fahrenheit by day to as low as thirty eight degrees Fahrenheit at night and being essentially conserves energy. The details are in the journal biology letters although some of the birds low body temperatures are on par with those of hibernating mammals. It's important to note that this is not fully fledged hibernation, which is a longer term response. True hibernation has only been documented in one bird so far at least common poor will in the US south. West one of my career goals is to find second harmonizing but in the Andes, he says, it's going to be the first place he looks.