Young Green Anaconda will only eat chicks

[charlesc84]

My moms husband has a young Green Anaconda that will will only eat chicks. Aside from this, overall its a really good snake.

My question is, will the snake get enough nutrition only eating chicks/chicken?

He's tried scenting mice and rats but the snake won't even flick its tongue to investigate what they are. He also tried a live mouse (this was when he first got it, but now a mouse would be to small anyway) but the snake won't budge. I've heard that rodents are better for Anacondas then fowl, but I have no idea if this is true. They live in Pa, so getting chicks isn't a problem, but I'm asking out of curiosity.