Factors Influencing
Bat House Occupancy Rate
The following is data collected from the
BAT CONSERVATION INTERNATIONAL'S BAT HOUSE PROJECT
For more than a decade 7,000 research associates, volunteers, and colleagues collected and shared data from bat houses in varied climates and habitats across the continent. These findings have dramatically increased bat house success.
Bat House Project Annual Surveys (% Number In Bold Reflect Wayne NJ Conditions)
Bat House Occupancy Rate
The following is data collected from the
BAT CONSERVATION INTERNATIONAL'S BAT HOUSE PROJECT
For more than a decade 7,000 research associates, volunteers, and colleagues collected and shared data from bat houses in varied climates and habitats across the continent. These findings have dramatically increased bat house success.
Bat House Project Annual Surveys (% Number In Bold Reflect Wayne NJ Conditions)
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| Mounting Location | Occupancy Rate | # Of Houses |
| Trees | 20% | 25 of 125 |
| Poles | 52% | 503 of 960 |
| Wooden/Masonry Buildings | 64% | 264 of 411 |
| Roost Chamber Height | Occupancy Rate | # Of Houses |
| Less than 15" | 44% | 98 of 222 |
| 15 to 24" | 51% | 485 of 957 |
| 25" or more | 64% | 239 of 374 |
| Rost Chamber Width (side to side) | Occupancy Rate | # Of Houses |
| Less tha 15" | 51% | 179 of 348 |
| 15 to 24" | 55% | 385 of 698 |
| 25" or more | 72% | 84 of 117 |
| Number of Chambers | Occupancy Rate | # Of Houses |
| 1 or 2 | 50% | 243 of 490 |
| 3 or 4 | 50% | 386 of 768 |
| 5 or more | 65% | 193 of 295 |
| Urbanization | Occupancy Rate | # Of Houses |
| Urban | 41% | 46 of 112 |
| Suburban | 42% | 112 of 267 |
| Rural | 57% | 664 of 1,174 |
| Dominant Land Use Within 1-mile Radius | Occupancy Rate | # Of Houses |
| Cattle Ranching | 48% | 32 of 66 |
| Residential | 48% | 146 of 306 |
| Farms/Natural Vegetation | 57% | 272 of 474 |
| Natural Vegetation | 59% | 304 of 519 |
| Dominant Natural Vegetation | Occupancy Rate | # Of Houses |
| Wetland | 28% | 19 of 67 |
| Desert | 31% | 25 of 80 |
| Forest | 54% | 409 of 753 |
| Grassland | 55% | 142 of 259 |
| Overgrown Field/Shrub | 61% | 132 of 217 |
| Nearest Freshwater Source | Occupancy Rate | # Of Houses |
| Marsh (all sizes) | 38% | 32 of 85 |
| Stream (less than 50' wide) | 50% | 229 of 454 |
| Pond (less than 25 acres) | 51% | 234 of 463 |
| River (greater than 50' wide) | 60% | 110 of 184 |
| Lake (greater than 25 acres) | 61% | 190 of 313 |
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Bat House
Annual Occupancy Surveys
Mounted On Poles
52% Occupancy Rate
Chamber Height 25" or more
64% Occupancy Rate
Chamber Width 25" or more
72% Occupancy Rate
Chambers 5 or more
65% Occupancy Rate
Urbanization - Rural
57% Occupancy Rate
Nearest Freshwater Source
Stream - 50% Occupancy Rate
Pond - 50% Occupancy Rate
River - 60% Occupancy Rate
Lake - 61% Occupancy Rate
Time Until First Occupancy
1 to 6 Months - 48%
7 to 12 Months - 15%
Annual Occupancy Surveys
Mounted On Poles
52% Occupancy Rate
Chamber Height 25" or more
64% Occupancy Rate
Chamber Width 25" or more
72% Occupancy Rate
Chambers 5 or more
65% Occupancy Rate
Urbanization - Rural
57% Occupancy Rate
Nearest Freshwater Source
Stream - 50% Occupancy Rate
Pond - 50% Occupancy Rate
River - 60% Occupancy Rate
Lake - 61% Occupancy Rate
Time Until First Occupancy
1 to 6 Months - 48%
7 to 12 Months - 15%
