It just wouldn't be Christmas without a quiz, would it?
We've got five pictures below, all you need to do is work out who is hiding under Santa's hat. When you have send us an email to enews@rspb.org.uk by 9 January with your five answers and we'll enter you into a prize draw to win a bird table from our shop, worth £79.99! Full terms and conditions are at the bottom of the page.
Good luck!
Mystery bird 1
Mystery bird 2
Mystery bird 3
Mystery bird 4
Mystery bird 5
Terms and conditions
For more on our science, check out the RSPB Centre for Conservation Science web pages.