Enough (fast) memory cards is always important. But it can also be nice to take a laptop with you, possibly with an external hard drive so that you can make a backup immediately. Moreover, you can also view your photos on the laptop and perhaps edit something already. Experience shows that you always take more photos than you thought you would at home. Animals are active and that means that you often take many more photos of the action than, for example, of a landscape or a cityscape.
