5. bird and bat different between

In fact, bats are the only mammals that can truly fly. ... Birds have beaks and no teeth, whereas bats have jaw bones with sharp teeth. Although they both fly, birds and bats feature different structures that allow them to take flight. Birds have rigid, feathered wings that they flap completely in order to fly.

I would choose

Delighted with their plan—impatiently—they waited for the close of day.