Interesting...I had lived in San Diego for three months at a time in between my job in NY in the past and I never thought of going to the zoo. I always end up in the Asian supermarket for shopping and Tiajuana for the el cheapo still-moving-$10-a-pot lobsters with friends. Now for me the zoo is the best way to chomp on photographing animals.
Very nice shots here...Although I like #1 very much, I find the expression of #3 interesting because of its angry look. 'Must be tiring to be the star of every photographer in town over there behind that glass...