There have been experiments showing that attaching magnets to birds' beaks inferfere's with their ability to sense magnetic north. So yes, they can "perceive" a

There have been experiments showing that attaching magnets to birds' beaks inferfere's with their ability to sense magnetic north. So yes, they can "perceive" any magnetic field, but since their main use for magnetic fields is finding north, any other field is likely going to confuse and disorient them (similar to how artificial lights confuse moths that mistake them for moonlight), making them more likely to crash into objects, not less.