What a great surprise to be filming the mad rush of motorbikes over the bridge, swivel round to the river and see this monster cruising along side to side like an alligator. I walked down to the river side to get closer to him. He looked up, cocked his head at me then went around in a circle then under the water. Stirring up lots of black silt from the river edges. This guy is fully in suburbia, the middle of Bangkok.