It uses them to sift through silt or pebbles to find food. The spoon-shaped bill allows it to sift easily through mud. Users can sift through vast databases to learn about a wide variety of topics. They also cause damage by biting holes in silk screens used to sift flour. Fort frequented the parks near the Bronx, where he would sift through piles of clippings. Tadpoles are detritivores that sift through the substrate looking for morsels. Gray whales are bottom-feeders, meaning they sift through sand to get their food. The word "sift" derives from "sieve". Children as young as 6 sift through garbage seeking money to buy food. They also sift through the bottom sediments using their tentacles. Thus the original meaning implied a deficiency in the ability to sift or decide. The use of SIFT directions have also been used to increase robustness of this process. Dugongs sift through the seafloor in search of seagrasses. Its aim is to provide a fast and efficient alternative to SIFT. There are many questions that Holmes must sift through.