If you want to catch them, try early in the morning. Put them in a glass jar or plastic container with a little soil in the bottom and some green plants. Make sure the container has air holes, and keep it someplace that s not too hot. Warm weather increases the number of grasshoppers that reach maturity. When there are so many, they can eat peoples gardens and crops in farmers fields.
Some people call the brown stuff tobacco juice.
At night, they come out to feed. They are gray with rounded body segments and seven pairs of legs. When they are startled, they curl up into a tight ball. Small holes in the top of the container will help them breathe. They are closely related to lobsters, shrimp and crayfish.