11. When bats fly , they produce a constant stream of high-pitched sounds. 12. And he's halfway to first base, and the bat flies by him. 13. When bats fly , evil lurks. 14. One of the characteristic feature of Streblid bat flies is their variable degree of eye reduction. 15. In " Go ", just before Robin attacks a thief, bats fly at him. 16. Wild turkeys strut among the pines and black oak; bats fly through the house at night. 17. The eighth video podcast is about the band going to see millions of bats fly at sundown. 18. During this activity, large numbers of bats fly in and out of caves from sunset to sunrise. 19. During the first night there, a bat flies into the attic while Meg and Nick are getting reacquainted. 20. Observations revealed that boas hang at the opening of the cave, waiting until bats fly out of it.