1 August 2012 – Big Brown Bat

This is actually the second time I’ve found a Big Brown Bat (Eptisicus fuscus) at the NRC, but this is the first dead one.  How a bat hits a building, I don’t know.

 

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4 thoughts on “1 August 2012 – Big Brown Bat

  1. Are you certain that it did actually hit a window? I mean, in terms of seeing a print or other evidence? It’s quite curious – probably not white-nose due to your location, but I think there’s a bit of an increase in bat mortality during spring and fall months near roosts. Any chance of getting a necropsy on it?

    • It’s on ice Heidi, so yeah, it can be necropsied at some point. No obvious fuzz on the muzzle.

      The safer thing to say is that my working hypothesis is window-kill. That could mean blunt force trauma or exhaustion from being trapped in one of the recessed alcoves of the building. Neither, of course, are satisfactory explanations for what looks like an other wise healthy bat face up near the base of a window. This is the second BBBA I’ve found at this building. The first survived, and I moved it to a roost on a campus tree well away from the building.

      • I guess my curiosity is over the non-exhaustion and non-trauma option; we have a large multi-species roost a few miles from here and we regularly find dead bats who otherwise look perfectly good. Thankfully the only buildings are a few small sheds, so we know it’s not trapping nor collision – I don’t want to bring up rabies, since it’s such an unlikely case, but perhaps there’s something else going on with the individual. An unhealthy bat would certainly be more likely to die of exhaustion from being trapped, but still… wonder if there are any bat mortality specialists who could chime in.

      • No obvious external injury doesn’t rule out significant brain damage from collision. My concussion last year brought that home to me as much as all the perfectly healthy dead birds I’ve picked up through the years.

        Exhaustion and death is an interesting hypothesis. It certainly happens to birds on migration, why not also bats? Obviously an impaired bat would be even more likely to succumb, but I’m not sure it’d be necessary.

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