emulating birdsong with a synthesiser design program

one goal I have in constructing synthesisers is to emulate natural sounds, 
for example the soundscape of the jungle or of temperate forests.  A lot of 
birds have almost pure sinewave voices, which have various pitch and timbre 
profiles, that can be emulated I think using low-frequency oscillators, because 
this 
would be good parallel to the movement of the birds voice box.

I'm very interested in emulating natural sounds, I had a lot of success with 
one sketch synthesiser which he used frequency modulation synthesis recorded 
and played back at various speeds.

Does anyone have any links about birds acoustics and anatomy that could help 
research for a bird synthesiser?  The synthesis engine in question is reaktor 
www.nativeinstruments.com


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