I obtained all of this information from the Tolkien Gateway wiki.
Gull: In the article, Seagulls are referred to solely as Gulls.
Also, smaller Gulls should be renamed to Panes or Petrels as that is how they are referred to in Telerin.
First of all: This mod is not affiliated with the Tolkien Gateway Wiki, and as such, names of certain things differ.
Second: They were called Seagulls by Legolas, if I'm not mistaken.
Thirdly: Seagulls and Gulls are the same, no need to make a fuss about them.
They were actually called Gulls by Legolas.
You are right, it doesn’t matter what they are called as Seagulls and Gulls are the same thing. I guess maybe some NPCs could refer to them as Gulls rather than Seagulls.
On a side note, maybe some NPCs could refer to Gundabad Orcs as Goblins.
What do you think?