Jumping insects are a type of insect that use their legs to propel themselves through the air. The two most common jumping insects are fleas and grasshoppers. Fleas are small, wingless insects that jump using their powerful hind legs. They are usually found in warm climates and feed on the blood of mammals. Grasshoppers are larger than fleas and have wings, allowing them to fly as well as jump. They are found in many different habitats and feed on plants.