Photobomb or Photoshop? Is hilarious picture of whale crashing seagull snap for real?

The picture, posted on Twitter, has gone viral and been retweeted 3,500 times

This could be a whaley good bit of Photoshop trickery - or the world's biggest ever photobomb.
A disgruntled seagull poses for a snap with a huge whale breaching in the background.
The picture, posted on Twitter, has gone viral and been retweeted 3,500 times.
But it's authenticity has been called into question. We'll leave you to decide.