Youtube channel Moth Light Media did a video on the largest flying birds: https://www.youtube.com/watch?v=0bXov-Z2_9U https://www.youtube.com/watch?v=0bXov-Z2_9

Youtube channel Moth Light Media did a video on the largest flying birds: https://www.youtube.com/watch?v=0bXov-Z2_9U https://www.youtube.com/watch?v=0bXov-Z2_9U Fossil evidence shows records of some truly enormous flying beasts. One of the topics of the video is how their existing relatives, the condors, make use of updrafts and air currents to avoid spending the energy to flap their wings. We're all familiar with the trope of vultures circling above a dying animal, but the circling may also be riding an updraft to maintain altitude without expending additional energy.