In my experience it doesn't seem to make any difference between IR and white-flash. While they don't seem to actually spook, they do stand and stare at both types of flash. When I have the cameras set on a multishot mode they seem to be curious and sometimes even walk toward the camera as they are having their pic taken. Now the black or invisible flash cameras may be different but I have no experience with any of these cameras.

Blessings.....Pastorjim