To determine the scientific name, you'd need to be more specific about which type of shag you're referring to. Some common shag species include:
* Australasian shag (Phalacrocorax carbo)
* Spotted shag (Phalacrocorax punctatus)
* New Zealand shag (Phalacrocorax carunculatus)
* Stewart Island shag (Phalacrocorax chalconotus)
If you can provide more information about the shag you're interested in, such as its location or any other distinguishing characteristics, I can help you find the correct scientific name.