 In the scene where Andy arrives in the library as Brooks assistant  and Brooks crow Jake is squawking, Tim Robbins (I) (qv) had to  time his line, "Hey, Jake. Wheres Brooks?", so that the crow  wouldnt squawk over his line, since the bird could not be trained  to squawk on cue. Robbins was able to adapt to this and time his  line perfectly from learning the birds patterns in squawking, for  which Director Frank Darabont (qv) praised him. Robbinss  improvisation is noticeable, and we can see that when he walks into  the room right up to the crow, he waits a short moment for it to  squawk while looking at it, and then proceeds with his line after it  does so.