Leopard Slugs mainly eat other species of slugs as well as dead and rotting plants and that is a good thing when it comes to gardens.
Leopard Slugs are very beneficial to growing a garden and they will not eat healthy plants so the Leopard Slug will actually help your garden if you have one.
Leopard Slugs eat other types of slugs including species of slugs that can damage garden plants and vegetables.
Some species of slugs can damage gardens and the plants and vegetables growing in that garden but the leopard slug will eat those species of slugs so your garden will be saved.
If you have a garden and have leopard slugs it's good to let those leopard slugs stay in your garden.