https://en.wikipedia.org/wiki/Sonation

http://singingwings.org/

Lyrebird bird 

Whip Bird
Bird Automaton
Bird Sonation 

Material from Music and Arts

Messiaen und die Vögel (Example of relevance of bird song in music and musical-analytic approaches to birdsong))
Dawn Chorus by Marcus Coates
Explores relationship between birdsong and human vocalization (and movement), and the different temporal realities
Dawn Chorus 

Also, familiarise yourself with the relevant musical terms used to describe (and imitate / interpret) birdsong:


Approaches to Artificial Birdsong