These ferocious pictures capture the moment two Canadian wolves battle it out for dominance in a "pecking order" dispute.
With saliva flying and razor sharp teeth on show, the two wolves clashed to prove who is the leader of the pack.
The images were captured by photographer Sue Demetriou from Bristol, who claims the display caused quite a stir at the Cotswold Wildlife Park in Oxfordshire.
She said: "The park was really busy and I heard a lot of people saying the wolves just looked like dogs, but they are wild animals.
"When the pecking order dispute began I realised it was a great opportunity to get some amazing pictures."
"The public watching were very uncomfortable, they got upset when they started fighting, but this sort of battle is very normal behaviour for wolves and was not as serious as the watching public thought."
Sue, 44, has only been a photographer for 18 months after getting a camera for Christmas but feels taking wildlife pictures has changed her life.
She said: "I have suffered from depression since I was a young girl, but photography is the first thing that has made me feel normal. Its a great feeling when you get a perfect shot."
Sue plans to keep visiting the wolves and hopes to get some more pictures of them but her real ambition is to go out into the wild to develop as a photographer.
She said: "I am going out there every week to watch the wolves, they are fascinating animals. It was very interesting to see the effect they had on the watching public."