Ключевые слова: amphibian, animal, aquatic, biology, bog, brown, bullfrog, conservation, croak, ecology, environment, environmental, european, eye, fauna, frog, grass, green, habitat, lake, leg, life, macro, marsh, meadow, moist, mud, natural, nature, outdoor, plant, pond, slimy, small, species, spring, summer, swamp, toad, ugly, vertebrate, warty, water, webbed, wet, wetland, wild, wilderness, wildlife, zoology,