Camo-clad rangers ambush a camp in a lush Thai national park, kicking away a machete and a firearm and pinning two suspected poachers to the ground – part of a training exercise to counter a lucrative wildlife trade."Go!" team leader Kritkhajorn Tangon yells as the group tackles the actors, who had near them sambar deer antlers and a blade covered in fake blood.Thailand's conservationists are struggling to stamp out the multibillion-dollar black market in animal parts, finding