IR flash and bat counts

["Frank Schiffel" <SchifF@xxxxxxxxxxxxxxxxxxxxxxx>]

there's interest in counting bats at a cave entrance using IR at night. 

has anybody any knowledge of a VCR or other system that could be set up at a location and do a count? I'd suggest a 35mm or larger with a back and a timer that imprints on the film. that's a bit expensive though. 

a 160 VHS tape would last 8 hours and should be adequate.

obviously a fixed location. fixed field of view, known distance to subject and all that so depth of field and all that are standard inputs for the technical side of the data gathering.

any suggestions? comments?

obviously something that would be set up and left running with no interaction.

thanks.

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