Alchemical ingredient \"White Gull\" where to get? (The Witcher 3: Wild Hunt)

Igord322
It is done in the alchemy tab on its own, like some other ing-you

Blackstormed
How to make it?) there is no way to find a seagull (

I met a recipe from some merchant (in Velen).

a white seagull CAN be found in Kaer-morkhin, inside the castle next to another witcher (I don’t remember his name) there will be boxes around him, I found 3 seagulls in them