Here are some examples:

* Bees and flowers: Bees get nectar from flowers, which they use for food. In turn, bees pollinate the flowers, helping them reproduce.

* Cleaner fish and larger fish: Cleaner fish eat parasites off larger fish, providing a cleaning service. The larger fish benefit from being parasite-free, and the cleaner fish get a meal.

* Oxpeckers and zebras/rhinos: Oxpeckers eat ticks and other parasites off zebras and rhinos, keeping them healthy. In return, the oxpeckers get a meal and a safe place to perch.

* Lichen: Lichen is a symbiotic relationship between a fungus and an algae. The fungus provides structure and protection for the algae, while the algae provides food through photosynthesis.

Let me know if you'd like more examples or want to learn about other types of species interactions!