How long usally is a giraffes memmory spand?

Well I can't say fore sure how long of a memory they have, but having worked with them and observing them it doesn't seem to be unusually short, they are trainable to audible sounds and ques. I do know they are very aware of their environment, and recognize the slightest little changes made in and around their enclosures. Giraffe do seem to take longer to train then many of the other animals that I have worked with, but none the less they can be trained.