How an actor calmed a vicious animal

(1)How an actor calmed a vicious animal
(2)Leonardo DiCaprio
(3)The swan had to shoot, but he was in pain because he was violent and rebellious

(1)As soon as Leo shows up and holds the swan in his arms, he becomes calm
(2)Leo had his neck wrapped around his neck

(1)A similar case is this story

(1)The goose that was hanging around the top model David Gandhi
(2)He gave himself a hug to David Gandhi

(1)Why is that