Ключевые слова: animal eye, black color, brown, color image, drinking water, evolution, fish, focus concept, goby fish, gravel, gray, hiding, hole, horizontal, image, image created 2000s, image created 21st century, image date, image focus technique, medium shot, mud, mudskipper, no people, one animal, perciformes, periophthalmus, rock object, side view, spectator, stone, surveillance, vertebrate, watching, wet, white,