The 'Birdcall' signal Whistle is a small whistle which gives off the sound of a bird call able to be used a signal without drawing unwanted attention. It only appears in Thief II.
Basso gives Garrett a Signal whistle to signal when the coast is clear to rescue Jenivere. 
- The birdcall appears to have a severely limited range and only works if used just outside of Basso's hiding place.
- ↑ OM T2 Running Interference
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