Sand fleas, also known as sand flies or beach fleas, are small crustaceans found in sandy coastal areas. They typically measure about 1 to 2 centimeters in length and are known for their jumping ability. These creatures thrive in warm, moist environments and are often seen during low tide, where they scavenge for organic matter. Despite their name, sand fleas are not true fleas and do not bite humans. They play a vital role in the ecosystem by breaking down organic material and serving as food for various shorebirds and other wildlife. Their presence indicates a healthy coastal habitat.