You can see the complee pic here http://en.wikipedia.org/wiki/File:Giraffe_feeding,_Tanzania.jpg Bu I need to know if is acacia or not. Anybody?
Hard to say - there's been a lot of taxonomic name changes in Acacia recently. A lot of the species that used to be classified in Acacia have been moved to different genera (because not all the species shared a common ancestor separate from other genera). In its new restricted sense, the genus Acacia is largely confined to Australia. Edit: just noticed from your link "Pictured in Tanzania in a zoo" - as with their animals, zoos are often filled with non-native plants. That makes identification even more difficult, as it could as easily be an Asian, South American or Australian tree as African. So all that can really be said is that it is a species in the subfamily Mimosoideae (which includes Acacia, Albizia, Leucaena, Prosopis, Samanea, and numerous other similar genera). Identification will need flowers, and possibly also seed pods . . . and that's if the Giraffe lets the flowers develop before it eats them ;-)
