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Low Impact Minimally Percutaneous Electronic Transmitter (LIMPET) tags are widely used for cetacean tracking. LIMPETS were originally designed in 2006 for tracking killer whales. Since then, LIMPETS have tracked more than 20 species of whales and dolphins.
Users deploy LIMPETS remotely with a pneumatic rifle or crossbow anchoring two small titanium darts into the thin outer layer of blubber. The electronics remain external and, when the animal surfaces to breathe, the tag transmits data to the satellites. Typical deployment durations range from weeks to several months.