Will a seagull incubate an infertile chicken egg placed in her nest?

A seagull is unlikely to incubate an infertile chicken egg placed in her nest. Seagulls typically exhibit strong instincts to care for their own species' eggs, and they may recognize the foreign egg as not belonging to them. Additionally, the incubation period and environmental needs of chicken eggs differ from those of seagull eggs, which could further discourage the seagull from caring for the egg.