While the lobsters are settled on the ocean floor they co-exist with the other bottom-dwellers. The other species that they live with are things such as: sea urchins, crabs, mussels, and algae. But, lobsters are considered to be bad neighbors because they will not hesitate to eat anything that lives around them, if they have the opportunity.
A while ago, sea urchins flourished and consumed large areas of kelp on the ocean floor, making it a very open area. But, as a result of a demand for sea urchins, their population has been reduced and the kelp is beginning to grow back. Scientists think that the growth of this new kelp provides places for young lobsters to hide and as a result is helping the population to grow.