As I've posted before, Merida dislikes birds.
In this video, the crows were scavenging in the farmer's field. Merida was upset because they were scavenging in the field behind her yard.
After this video ends, I sent her out and she barked barked barked at them. They flew away, then returned but over beside the neighbor's yard. She could still see them slightly, and was not impressed.