Very impressive. For those who have not seen it (and everyone on line has so far been non-specific), at least on the day I saw them, the bats emerged primarily from the southern end of the bridge and flew along the southern shore of Lady Bird Lake in a southeasterly direction. The main part of the departure took approximately 8 minutes, and began for us about 6 minutes before official sunset. That should help you position yourself if it is consistent (which I do not know, but since they likely roost in same places, is likely so), and get the timing right. The park lands along the north side of Lady Bird Lake have some good viewing spots.
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