A couch potato: someone who sits on a sofa or couch for several hours watching TV
A black sheep: someone different from other members of the family (not necessarily with a negative sense)
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A party animal: someone who enjoys going to the parties
That's enough for today, now your turn.
As stubborn as a mule.
Make an ass of oneself. (Make a fool of oneself.)
As wise as an owl.
As happy as a lark.
THe animal idioms sound great! how would I go about teaching that?!