It is much harder to prove Commensalism than it is to prove something like Mutualism or Parasatism. It is easy to pinpoint one organism's benefits but much harder to figure out whether the other organism is unaffected or not. This is why scientists have much fewer examples for Commensalism than any other type of Symbiosis.
One example of Commensalism is the Titan Triggerfish and other smaller fish. The Titan Triggerfish creates feeding opportunities for the smaller fish by moving large rocks and revealing plants and other things for the fish to feed on. The Titan Triggerfish appears to be unharmed and the smaller fish benefit from the meal.
Another example of Commensalism, according to scientists, is a Remora shark and larger organisms, often whales. The Remora shark has disks on top of its head, which allows it to stick itself to the larger organisms and hitch a ride. The larger organisms are usually quite sloppy eaters, and the food that floats away from the organism's mouth gets caught by the Remora. The Remora benefits from the relationship, but the larger organism seems unaffected.
Another example of Commensalism is the Poison Dart Frog and the Bromeliad. After the mother has laid her eggs in the jelly of another tree's leaf and the father has fertilized and hatched them, the mother carries them up on her back to the Bromeliad. The Bromeliad is a plant which is often filled with water. The mother takes her tadpoles and puts them in the water to raise. The frog benefits, as the young have a place to stay, but the Bromeliad is unaffected, as the frog does not affect it in any way.
One example of Commensalism is the Titan Triggerfish and other smaller fish. The Titan Triggerfish creates feeding opportunities for the smaller fish by moving large rocks and revealing plants and other things for the fish to feed on. The Titan Triggerfish appears to be unharmed and the smaller fish benefit from the meal.
Another example of Commensalism, according to scientists, is a Remora shark and larger organisms, often whales. The Remora shark has disks on top of its head, which allows it to stick itself to the larger organisms and hitch a ride. The larger organisms are usually quite sloppy eaters, and the food that floats away from the organism's mouth gets caught by the Remora. The Remora benefits from the relationship, but the larger organism seems unaffected.
Another example of Commensalism is the Poison Dart Frog and the Bromeliad. After the mother has laid her eggs in the jelly of another tree's leaf and the father has fertilized and hatched them, the mother carries them up on her back to the Bromeliad. The Bromeliad is a plant which is often filled with water. The mother takes her tadpoles and puts them in the water to raise. The frog benefits, as the young have a place to stay, but the Bromeliad is unaffected, as the frog does not affect it in any way.