This activity works best if you have access to an active worm bin or compost pile, however you could use a shovelful of dirt from your garden, though you may not find as many creatures.  Gently place a shovelful of dirt/compost contents on a newspaper and show kids how to gently sift through the contents and hand worms or other creatures you may see.  Give each child a BINGO card and see how many different creatures they can find.  Try to be the first one to get 3 in a row!  You can use this game as a jumping off point for looking carefully at the diversity of life in your worm bin.  What kinds of characteristics do the critters have in common?  Can you see inside the worm egg? Can you tell which foods the sow bugs like the best?  Encourage your kids to ask their own questions and continue to explore!