Faberge egg: what kind of bird is at the top?

The Bay tree egg (also known as the Orange tree egg) is a jeweled carved enameled Easter egg. I took this photo of it in the museum in St. Petersburg last Summer.

It was made under the supervision of the Russian jeweler Peter Carl Faberge in 1911, for Nicholas II, Tsar of Russia, who presented the egg to his mother, the Dowager Empress Maria Feodorovna on April 12, 1911.
It was sold was sold in 1965 for $35,000 and is now part of a collection of nine Imperial eggs valued at almost $100 million.

Reference: http://www.bestpysanky.com/1911-Bay-Tree-Faberge-Egg-p/e07-17-3.htm