Why does alien species often displace native species?

Alien species often displace native species due to their lack of natural predators, which allows them to proliferate rapidly in new environments. They may also outcompete natives for resources such as food, space, and habitat, often adapting more effectively to the new environment. Additionally, invasive species can introduce diseases or alter the ecosystem in ways that disadvantage native species, further tipping the balance in their favor. This competitive advantage can lead to significant declines or even extinction of native species.