A little blue penguin is back where it belongs after causing trouble on a Wellington motorway this morning.

It spent more than an hour in the middle of State Highway 2 - between four lanes of traffic on the Ngauranga flyover.

Police officers came to the rescue with a rolling block to slow traffic down.

Then, as an officer approached, the penguin calmly jumped down and tottered across the road, across the railway tracks and into the harbour.