The South Georgia shag has similar shape to a blue-eyed shag, but slightly bigger in size. Body length of a South Georgia shag is around 72–75 cm (28–30 in), with a wingspan of 54–60.8 cm (21.3–23.9 in). Males usually has a longer wingspan and tail length than female shag. South Georgia shag can reach 2.5–2.9 kg (5.5–6.4 lb).
The South Georgia shag has a strong, long beak, with grooves on both sides of the upper beak and a hook at the end of the beak for pecking at fish. A throat pouch at the base of the lower beak. It has small nostrils, which are completely hidden in the adult. The neck is slender. Two wings are of moderate length and lack the fifth secondary flight feather. Tail is rounded and stiffly straight, with 12–14 tail feathers. Cannot fly if the feathers are wet.
The breeding season occurs in October to December.[2] The female lays 2–3 greyish or bluish eggs during the breeding period, which will be incubated by both parents for 28–31 days. Chicks continuously brood for 12–15 days and leave the nest at two months and fledge at around 65 days.[citation needed]
