The gorilla cub-equivalent, Hasani, is 4 years old.  The San Francisco Zoo's gorilla family story is fascinating.  Abandoned by his birth mother, Hasani was raised by zoo staff (who slept with him for 5 mos. until an experienced gorilla mother became his surrogate mother).  I'll add more on the the relationships later (for anyone interested).

  A research study focuses on the gestures they use for communication.

  That's Hasani's usually indifferent father, Oscar Jonesy, at the left.

 The shots in June are almost all taken through the smudged, streaked, scratched (or even carved into) plexiglass windows, either at the side area where we can sometimes see them close-up or at the front of the enclosure.  Those will have reflections and are somewhat hazy.

  But I've not uploaded most of the June ones yet, as I found many from May (from the pocket cameras) which I had not even seen, so some of those are here also. Visited several other zoo residents too.  June 7, 2013. #sftigercub

Am using a combo of the Canon Rebel XT + 70-300mm zoom, the little Canon SX260, and for anything not needing zoom (almost everything at the zoo needs it), the Sony RX100.
This set is included also in Canon SX260 galleries that have the other zoo visits to avoid confusion when navigating zoo sets.

  Here's a Flickr photography discussion about trying to get clear pictures thru' the zoo's plexiglass windows in the tiger exhibit), which is why the effort to find fence views.

To see the images that are 1024 pixels wide (or larger) for the thumbnails below, *click* on 'ORIGINAL' option below the first photo that comes up after you click on a thumbnail; otherwise, and that setting will stay for the session.  It defaults to 800 pixels wide.