Now, grasshoppers can be little or big. I saw one the other day was big as my hand. They are brown and green and they are found in grass, hence the name, and low shrubs. They have antennae and super strong back legs that they use for hopping, hence the rest of the name. Much like a cricket, grasshoppers make noise by rubbing their back legs against their forewings.
For this activity you're going to need a plastic pet cage or aquarium with a lid, some paper towels, leaves, twigs, dirt, grass, wildflowers, and a butterfly net. What you're going to do is put the paper towels on the bottowm of the cage. Then throw in some of the dirt, twigs, and leaves. Grasshoppers need someplace to hide and climb. Use the butterfly net to catch the grasshopers. Put said grasshoppers in the cage and put the cage on a bright windowsill out of direct sunlight. That way you don't cook the little buggers. Feed them small amounts of fresh grass or wildflowers each day. Watch them for about 5 days or so. Then take them back to where you got them and release them. Then get out your journals and have your kdis write down their experiences. Ask them what grasshoppers need to live and how they are like crickets adn how they're different.
Have your kids sketch out the grasshoppers. Go on a field trip and look for grasshoppers but don't catch. Have them hop like grasshoppers. Watch a grasshopper as it jumps. Have the kids guess how high and how far the grasshoppers will jump.
Hope this gives you some ideas.