Is this normal? · On the ground
A barking or buzzing sound while taxiing
Short answer
Normal on some Airbus jets. It's often a hydraulic power transfer unit balancing pressure between hydraulic systems while one engine is running.
Where this comes from
Thunks, whirs, chimes and the famous "barking dog" — what you're hearing, from gate to gate.
Read: Normal sounds on a flight
Based on: FAA Airplane Flying Handbook (FAA-H-8083-3); FAA, "Turbulence: Staying Safe" (seat belt sign rules).