I was on the terrace when i saw a craw with a piece of muruk in its beak. A normal sight but then i saw  it walking towards a sack which had dry leaves in it and put this piece of snack inside it and covered it with dry leaves!! i don't know why that craw did that ..sometimes our dog pepper does that,when he gets biscuits he will take it away and dig a hole and bury it!!something like that may be..