Trivia

He was very close to his leading lady from The Shallows (2016), Blake Lively. Lively later admitted that she occasionally turned to Sully for acting advice.

Sully lives (to this day) in a seagull sanctuary in Australia. He is a very private bird and shows absolutely no showbiz attitude in real-life, even though he is famous for his Streep-like work ethics in the film industry.

Two extra seagulls were used to portray Steven Seagull in The Shallows (2016). According to producer Matti Leshem, she added "They were all good but not nearly as good as him. Peggy was the vocal one, the very squawky bird. Gaviota (which means seagull in Spanish), I think he's almost 30 [as Steven is estimated to be about 15 or 20 years old]. The most challenging thing about Sully Seagull as an actor is that seagulls are remarkably clean. They self clean a lot, so the blood on Sully, obviously fake blood, he kept wanting to clean it off, so we had to deal with that.".

Appeared with Jamie Dornan in Barb and Star Go to Vista Del Mar (2021), his first comedy. He was also in the music video, "Edgar's Prayer", playing a gull on a tire.