GULLS OVER THE SYDNEY HARBOUR BRIDGE

["David and Margaret Merrall" <>]

On a recent trip to Sydney we attended three concerts at the Opera House.
At the intervals we went out onto the concourse overlooking the Harbour Bridge. 
This would have been at about 9pm.
There appeared to be hundreds of Silver Gulls wheeling in the lights over the 
bridge.
Has anyone a theory about why these birds do this?

David Merrall
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