I guess this thread has developed from a 'portrait only' to include BIF. I'm stoked to be able to contribute, up until now 95% of my shots have been in the Denver Zoo, but this month I got a 7D primarily for shooting kids sports.
It may be the most expensive $850 I've ever spent because the 70-200 f4 IS is the longest lens I have. The last 3 were with a 1.4TC.
First one was taken a couple of years ago from a bedroom window. The others recently at Ferril lake in Downtown Denver.
#1. hawk? sorry my expertise is still minimal (EDIT: just found a picture, I think it might be a Young-ish Cooper's Hawk). T1i, 70-200 f4 IS @ 200mm f4 1/30s ISO400 (got lots of blurry shots)
#2 BCN Heron. 7D 70-200 f4 IS + 1.4TC I @ 280mm f5.6 1/6400s ISO:800
#3 American White Pelican f5.6 1/2500s ISO:400
#4 Snowy Egrets jostling for the prime spot, f5.6 1/1000s ISO:800 (probably had a polarizer on)
Still trying to figure out the best combination of shutter speed and ISO for BIF shots, but tending towards ISO:800 because with NR the noise is manageable and my tracking needs work.