Joel Sartore is an amazing photographer. He is doing a series called "The Photo Ark" with National Geographic. He is taking pictures of rare and endangered creatures. On his site he tells you how to buy the prints and help the animals - and how to help the zoo or facility he photographed them at.
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He does "portraits" of zoo animals in this project. And they are cool. Here is the LINK.
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Below is a picture of a Clouded Leopard. There are decreasing in the wild.