Ok, thanks, that means the beginning of their fall.
I ask because I'm still uncertain on when to go: in our (northern hemisphere) summer, i.e. July/August, or in our winter (December/January). They say that to see animals it would be better to go in our summer, when it's dry there; however I tend to look for a warmer climate, so the idea to leave when it's full summer here to go where I have to wear warm clothes (even just in the evening or at night) doesn't attract me that much.