Here are some useful sites that might help you find your information!
The World Wildlife Fund does a lot to help animals all over the world. You can find out where your animal lives and what dangers it faces, but you might need extra information on what people are doing to help.
Animal Planet is a good way to learn some basic facts about your Endangered animal, and will also give you links to sites where you can learn more.
A to Z Animals is a good place to get basic information about most animals, but is not always specific about the species. It also has A LOT of information, so make sure to look at the headings for what you need.
Of course, you are always welcome to do your own research, but make sure that your site is reliable!