Eels that live in the sand at beaches are typically species like the sand eel or the surf eel, which inhabit shallow coastal waters. These eels often burrow into the sandy substrate to hide from predators and ambush prey, feeding on small fish and invertebrates. Their elongated bodies and smooth skin allow them to navigate easily through the sand. They play an important role in the marine ecosystem by contributing to nutrient cycling and serving as prey for larger fish and birds.
Sand eels eat tiny pieces of mackerel
Not all of them do but some may live in beaches there.
No they only eat fish.
Sand eels eat a variety of crustaceans including crab and shrimp. They are actually a species of small fish rather than an eel.
Sand on beaches came from RIVERS.
that eels can travl on wet grass and wet sand
Sand eels are about 5" long.
The beaches with black sand are volcanic in origin.
Eels live in holes and crevices in the corals.
the monk seals live in sand dunes and rocky beaches
Many species are found off the western coasts of Europe from Spain to Scotland, and in the Mediterranean and Baltic Seas.
The mathematical relationship is direct (not inverse), because sand eels feed on herring, and as the herring decrease, so decreases the sand eels' food supply. Please note that sand eels are not to be confused with the gigantic variety of species called sand worms, as depicted in the 1988 movie Beetle Juice. These creatures feed solely on actors and film crews.