Odd, the giraffes were out on Sunset savanna (the big savanna between Kidani and Jambo) several nights between 11/29-12/7/2018, because I watched 2 of them, Gigi and her mother, from my balcony on Kudu trail in Jambo a couple of nights around 11 pm. The larger giraffe even sat down for about 15 minutes 2 different nights before wandering off and on our last night I spotted one of the adult giraffes standing looking into the people pen - it was such an odd thing to see the Giraffe standing there silently staring into that pen at 11 pm!
I also watched the Arusha giraffes one night about 10 pm from the Arusha overlook towards the Zebra trail side of Arusha savanna.
Sunset savanna at 18 acres is the largest and has some cul de sacs so sometimes the animals aren’t visible because they are elsewhere on the savanna.