Prior work on Bird Flock identification

Hi there!

We have a project underway called "Identi-Flock" which is an ambitious attempt to port our individual pollinator identification software, www.withymbe.info over to identify flocks of birds. I say ambitious because we are dealing in DSP with aggregate noise-like signals, and need to filter real-world noises like human voices, aircraft in a much broader spectrum?

If anyone can offer any pointers, please, to prior work on flock audio identification, rather than individuals, I would be most grateful?

Tally ho!

Andrew.