You help them decide what it takes to win – all in a line, diagonal, round the world, etc.
Then as they find these items in nature, they color in the squares with a highlighter.
Instead of a letter and number code for a traditional bingo 5×5 grid, they sketch plants and animals in the grid. Before heading out for a walk in the woods, prairie, or wetland, kids could prepare their own nature-based bingo game where they record their observations (see Kid’s Corner for a couple of bingo pdfs already available).