Rat5 - But we are back to the basic question: not of if it's allowed by the regs, and often it is not, or SOP's, but does it make good airmanship common sense in most cases? You CAN do lots of things, but is it necessarily a good idea.
Except for the USA it's typically allowed by the regs and individual companies have different SOP's, as Denti mentioned. So if the regs allow it, and the SOP's allow it, the common sense question is an opinion not supported by the regs or SOP's.
The answer to the question 'is it good airmanship in most cases' is yes, provided there aren't other reasons not too. Like specific arrivals that have known bird issues or during bird migratory seasons.