There is a long-running about whether birds first took off by running and flapping from the ground up, or whether they jumped as gliders from the tree down.
Remarkably, these animals can be placed within the crown group of the living cnidarian clade Medusozoa, which is not exactly what Darwinists should expect.
Incidentally, a few days ago I received a message from my paleobiologist colleague Dr. Ken Towe, a retired senior scientist at the Smithsonian Institution.