Hi I found this info... I think can be helpfully for someone in some of their projects... basically shows the behaviours for cars... but some examples ca be applied for crow systems or for character simulation...
http://www.red3d.com/cwr/steer/
Basically watching the java examples you can have a light idea how make the things... read all the doc he put... I think it´s a very hard job...
Excuseme I don´t read this... I think the most important... I don´t donwload yet, but I suppose it´s have to be wrote in C++...
http://opensteer.sourceforge.net/
This library make all the things watched in the Java Examples...