Animals like these two species - shot in bushy park, London, in late October 2021 - can have different relationships.
the two main relationship catergories are:
Commensalism is a relationship between two organisms where one receives a benefit or benefits from the other and the other is not affected by it. In other words, one is benefited and the other is neither benefited nor harmed.
A symbiotic relationship is one in which organisms, people, or things exist together in a way that benefits them all. This is also called Mutalistic, which in biological terms means a symbiosis which is beneficial to both organisms involved.