A, ANIMAL, BADACZ, BADANIA, BADANIE, BEAR, BIOLOGIA, BIOLOGIST, BIOLOGY, DAN, EXAMINES, GURAVICH, JAMA, LUDZIE, MAMMAL, MAMMALIA, MARITIMUS, MIS, MOUTH, NAUKA, NAUKOWIEC, NIEDZWIEDZ, OF, PEOPLE, POLAR, POLARNY, RESEARCH, RESEARCHER, RESEARCHES, RESEARCHING, SCIENCE, SCIENTIST, SSAK, TEETH, THE, TRANQUILIZED, URSIDAE, URSUS, USTA, USTNA, ZEBY, ZOOLOGIA, ZOOLOGIST, ZOOLOGY, ZWIERZE, ZWIERZECY,