The Indiana Bat is actually a migratory bat, and it often ranges in areas all over the west coast of the United States. When mothers are making roosts, they usually do so with trees at least 16 inches DBH (diamater at breast height), and the clearing of forests is likely a cause for declining populations. A survey was done in an area where the bats were known to be, but was deemed to be deforested soon, and even before the woods were cut down the survey concluded that no Indiana Bats could be found within the area, contributed to that fact that a major portion of nearby land had already been cleared out. (15)
The most recent population estimations put the population of the Indiana Bat at about five hundred thirty-four thousand bats, higher than the lowest population of slightly more than four hundred fifty thousand bats. (16)