I visited Kaziranga in Assam, India which has the highest density of tigers. The local rangers said they don't get any help from these aid organizations. Looking at WWF activities in detail suggests they do almost nothing for the local people. The WWF leadership ( http://www.worldwildlife.org/about/leadership ) has no representation of people who actually live in the areas which are key to survival of these species. In my opinion, that dooms it to failure. My belief is that to save tigers, you have to provide the people who are poaching tigers with a viable financial alternative. I would much rather the person taking a photo of a tiger in the jungle be a genuine local rather than a corporate employee doing greenwashing. http://tigers.panda.org/t2/mars-cindy-jiang-joins-wwfs-tiger...
Keep it local and real. Charities for sick/underprivileged children in your local region are everywhere and do much good in the world.
If you want to help children in far-flung countries do it by always pushing for free trade laws and speak out against barbaric religious practices.
Though neither your advice nor mine is gonna do much for animal conservation, if that happens to be what acd cares about.
Also, don't support biofuels and speak out against them and especially subsidies that favor biofuel production.