Army Of African Bullfrogs, Pixie Frogs In The Water In Central Kalahari Game Reserve, Botswana

army group african bullfrog pixie frog dip swim water amphibian animal central kalahari game reserve botswana central kalahari game reserve pixie frog african bullfrog male vocal sac freshwater river pond vocal sac pyxicephalus adspersus creature nat geo natural giant africa rainy national environment national geographic planet swamp call mating carnivore calling behavior season nature ecology park wetland species habitat marsh