Today is the last day to acquire items for the Savanna Collection Event. It was possible to vault this collection once daily and those who did will have 7 Hammered Ostriches and more importantly +70 skill points. Zynga waited for the last day but they did fix the spelling error on the reward popup . Once the Savanna Collection is vaulted for the last time, nothing on the collection page changes and it states that you can vault again. Perhaps they will bring it back someday or maybe that will change once the event has expired.