To understand how a brown bear and a seagull might benefit, I need to know:
* What are they doing together? Are they interacting directly, or are they simply in the same environment?
* Where are they? Are they in a coastal area, a forest, or somewhere else?
* What are their individual needs? What does each animal need to survive and thrive?
Once you give me more information, I can explain how a brown bear and a seagull might benefit from their interaction or their shared environment.