Two rat snakes were spotted performing an amazing mating dance in a family's backyard in Thailand.The serpents rustled under the thick grass before resident Sarintyada Boom saw them when they raised their head in Khon Kaen province.But instead of being scared, house owner Sarintyada was left amazed at the strange movements of the wild animals.Footage shows the rat snakes intertwined as they lifted up their heads and bodies in a sea of wild grass.Sarintyada said: ‘I called a relative to watch the snakes with me. It was the first time I've seen animals do that.'