This is the astonishing moment a friendly monitor lizard emerged from the ocean and walked on a packed beach to the amazement of sunbathers.<br /><br />The 5ft long reptile was seen swimming around the bay in Krabi, southern Thailand on January 29.<br /><br />He casually paddled over to the shore then sauntered along the sand as holidaymakers looked on.<br /><br />Incredibly, the giant lizard - which has a venomous bite and can attack humans - was un-phased by the tourists and walked among them as they took pictures on their phones.<br /><br />The reptile then waddled over to nearby trees before disappearing into the forest at the Than Bok Khorani National Park.<br /><br />Park ranger Weerasuk Srisudjung said there are about 10 water lizards living in the national park. <br /><br />He said: "These water lizards had been here for many years. This national park is a reserved place, so nobody comes to ruin their habitats.<br /><br />''They like to show up on a sunny day to keep themselves cool in the water. They never hurt tourists or any officers in the national park.''<br /><br />The officer also said that the existence of the reptiles showed the healthy ecosystem of the island which was something tourists need to be aware of.<br /><br />Weerasuk said: ''We are happy to see animals and humans living harmoniously. However, they are still wild animals that could attack others to protect themselves.<br /><br />''It is best for tourists not to touch or hurt the water lizards and other animals on the island and let them live naturally.''