PATHFINDER

Beginning with the . in the square box, follow a continuous path to find things that whistle. The trail passes through each and every letter once, and may twist up, down or sideways, but never diagonally.

Bird, Budgie, Builder, Cockatoo, Dog Trainer, Firework, Flute, Guard, Kettle, Lark, Nightingale, Parrot, Person, Piper, Recorder, Ringtone, Steam Train, Wind