Here is an example of an 1/8 second blur which might help those in OOTB for the assignment. Best subjects to go after are groups of birds that you don't expect anything to be sharp, or birds flying flapping wings rapidly. Btw working with a colorful subject works great for this slow speed, lots of neat things are possible.
It is possible to have individuals but is a challenge !! The normal speed for those is 1/15 to 1/30 depending on distance, speed and angle of approach !!!
Comments welcome and much appreciated
Nikon D300
70-200 2.8 VR
f 14 1/8 sec
ISO 100 Av - 2/3