Certainly!
Seagull (popular term) used in the title; actual specific gull names used as captions for each picture.
http://www.oceanlight.com/seagull_photo.html
Definition of unicorn: "an imaginary creature usually depicted as a white horse with one long spiralled horn growing from its forehead"
Definition of seagull: "a popular name for gull"
(source: Collins English Dictionary)
Note that the OED also shows evidence that the term "seagull" has been...