They are prey and predator.
Predator-prey relationship, where the robin, as a predator, preys on the worm as its food source. This relationship is crucial for the survival of both species, as the robin relies on the worm for nutrition while controlling the worm population.
Predator and prey relationship because the prey of the animal is what the predator eats so it's a predator and prey relationship. Info found on science link 7
both preditor and prey
Actually, both.
Sea Cucumbers are a prey animal. They are designed so that they can spew their cuts out and regenerate their outside skin once a predator as eaten the original skin.
sea lions, orcas and sharks
yes it is both
Penguins prey on fish. It is also prey of the sea lions and killer whales.
The most part. But sea otter is mostly prey. It's prey to orca whales, sharks, and other ocean creatures.
Killer whales prey on sea lions, as do some types of sharks.
Usually hawks are predators of the Robin