This video says about itself:
8 April 2018
Bats are absolutely incredible animals. They’re highly unique creatures that possess the extraordinary ability of powered flight. It’s long been thought that every bat species must have descended from a common ancestor but, during the 1980s, a very interesting and controversial idea about bat evolution came to prominence; the ‘Flying Primate’ hypothesis.
How nectar bats fly nowhere. The first direct measurements of wingbeat force show how hard hovering is. By Susan Milius,
7:00am, October 15, 2018.