Abstract
A miniaturized optical telemetry transmitter for small animals was designed, constructed and field-tested on free-ranging nocturnal crabs [Ocypode quadrata]. The device produces accurately timed flashes that can be used for individual tagging, tracking and telemetry. When observed with a night vision scope, the flashes are visible for several hundred meters. Transmitters are inexpensive, relatively simple and rugged. Weight is less than 1 g, and working life is about 4 wk with 4 g of hearing aid batteries.

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