Speculating here, but i suspect there was no pin or similar so that people in the field could just power it on, attach it to a bird, and let the bird go. Never

Speculating here, but i suspect there was no pin or similar so that people in the field could just power it on, attach it to a bird, and let the bird go. Never mind that i suspect that the data amount was not much more than a sms with a GPS position sent to a fixed number every X hours.