Ключевые слова: adult, animal, aquatic, biology, chordata, circular, closeup, colubridae, dice, europe, european, eyes, fauna, freshwater, grasssnake, gray, green, herpetology, juvenil, juvenile, lake, macro, moss, natricinae, natrix, nature, nonvenomous, predator, pupil, rattlesnakes, reptile, river, scales, serpentes, serpentine, serpents, skin, snake, squamata, swim, tessellata, water, wild, wildlife, yellow, young, zoology,