A Marsh Frog Inflating Vocal Sacs Croaking And Swimming In Green Pond

marsh frog animal wildlife inflating vocal sacs green pond nature habitat swimming frog marsh water green frogs rana ridibunda natural surface algae environment national geographic ridibunda rana wild fauna croaking toad calling behavior carnivore wet skin head sacs slowmo nat geo amphibian breeding forest aquatic face eyes webbed toes selective focus portrait ecosystem background wetland ecology