What does the word "sick" refer to in this context? I don't think it would mean being sick.
You're right! The word "sick" in this context does not mean literally feeling sick. It means "tired" or "bored". The wolf is saying that he is bored of eating squirrels and wants to eat something new. Ex: I'm sick of eating chocolate ice cream all the time, I want to try a new flavour. Ex: I'm sick of all this homework, I wish I could do something fun.
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