An over abundance of crown-of-thorns starfish and long-spined sea urchins can be damaging for coral reefs. Luckily, there is a renowned defender of the reefs ready to take them on... Subscribe: http://bit.ly/BBCEarthSub #BBCEarth #WildThailand Watch more: Planet Earth http://bit.ly/PlanetEarthPlaylist Blue Planet http://bit.ly/BluePlanetPlaylist Planet Earth II http://bit.ly/PlanetEarthIIPlaylist Planet Dinosaur https://bit.ly/PlanetDinosaurPlaylist Wild Thailand Go beyond Thailand's beaches. Wild Thailand reveals a sacred kingdom of awe-inspiring beauty. It takes in the towering limestone cliffs, the paddy fields, the hidden temples and the teeming city of Bangkok, before visiting the forests of the north. Each episode is packed with wildlife. While full moon parties get underway on the beaches of Ko Pha-Ngan, a dazzling light show takes place on the island's reefs. In Bangkok, we meet the animals that have made this urban environment their home. Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. Want to share your views with the team? Join our BBC Studios Voice: https://www.bbcstudiosvoice.com/register This is a commercial page from BBC Studios. Service information and feedback: http://bbcworldwide.com/vod-feedback--contact-details.aspx