What was on the Pope's Crucifix at Christmas Eve Mass 2012?

Dear Brothers and Sisters in Christ

I noticed on the the Pope’s crucifix Christmas Eve Mass 2012 something that looked like a 4 legged animal.

Did you also notice this?
What does it symbolise?

It was the image of a lamb.

It is a symbol that when crucified Jesus was the lamb of God who took away the sins of the world.

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