The American bullfrog is a large frog native to eastern North America, and its deep jug-o-rum call is one of the most recognisable amphibian sounds in the world. Because the call is loud, low and easy to identify, field recordings of it have long been used as shorthand for ponds, swamps and summer nights in documentaries, nature programmes and games. Online, creators reuse the same kind of recording to add instant outdoor atmosphere without needing a full soundscape, which keeps this simple croak popular for educational clips, memes and relaxing nature edits.