What do birds and bats have in common in the way they move?

What do these two different species have in common? Let’s start by classifying each.
Bats are a detachment of placental mammals that are capable of active flight. It is flying, not soaring. Bats have two distinctive features:
– the ability to flapping flight.
– echo location.
Birds. Their distinctive feature also lies in their predisposition to flapping type of flight.
This is what brings these two species together.