I stand corrected on that. I just rechecked and the value is 60 degrees of bank in the Canadian regs.
However, the point is moot because in reality given the roll rate of jet aircraft and the potential for other problems with maneuvering a jet aircraft in this manner, the likelihood of this succeeding is low.
Add to this the fact that the predictability of bird flight patterns when threatened and the birds actually remaining in the same lateral distribution is low and I cannot see any real value in this strategy.
I can see the value in a change in vertical profile to avoid a flock of birds and can speak from practical experience using it.