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Status & Trends

Measures of where North American bats occur, in what numbers, and how these metrics change over time.

NABat uses multiple lines of evidence to understand where, when and how bat populations change over time. Bats are challenging to monitor and not all survey types work well for all species. Additionally, different response types are more or less sensitive to observing changes in populations. Looking at multiple status variables informed by several data streams provides a more complete view into population status and trends.

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Summer Abundance

the number of bats occupying summer roosts and surrounding habitats each year and how this changes over time.

Summer Occupancy

where bats occur across the summer landscape and how this changes over time.

Winter Abundance

the number of bats occupying winter sites each year and how this changes over time.