Is yellowbird upside down fortune telling accurate?

Birds don't sleep backwards. This should refer to bats.

The reason is that bats cannot stand and walk at all. Bats can fly. Their wings are wing membranes and their feet are connected to their heads. Although they can fly with this piece of film, it is hard to stand. Bats can't stand, they can only hang upside down. It has become a living habit to sleep backwards in dark, damp and cold caves. This is also a labor-saving way. Loosen the branches and spread your wings, and you can fly. Sleeping upside down also helps blood circulation and restores physical strength.

Its claws can only hang itself, but can't support itself. Bats have valves in their blood vessels, so the blood will not flow back and the brain will not flush blood.