The San Diego zoo was easily the best zoo I have ever been to. The exhibits are awesome and there are a ton. We spent pretty much the entire day there last Saturday there. Our good friend since middle school, Peter, showed us around and let us stay with him because he is awesome.
Part of what made the San Diego zoo so great was that they had diverse subsets of species. Like the duck. They had a bazillion types of ducks. This is a bufflehead duck. It is beautifully iridescent.