ANIMAL, BACKGROUND, BIOLOGICAL, BIOLOGY, CATTLE, CHOKSAWATDIKORN, FAUNA, FLATWORM, FLUKE, INVERTEBRATE, LIGHT, LIVESTOCK, LM, MICROGRAPH, MICROSCOPE, MICROSCOPY, NATURE, NO-ONE, NOBODY, PARASITE, PARASITIC, PLATYHELMINTH, TREMATODA, WHITE, WILDLIFE, WORM, ZOOLOGICAL, ZOOLOGY,