Let's save this one

You may or may not have noticed, but the Yangtze river dolphin is probably extinct. Not a surprise, but anytime a large vertebrate species disappears, it's a noticeable loss. There are other populations of river dolphins; I imagine (without checking) that the Amazon river dolphin is probably still in pretty good shape, population-wise. According to some fairly uncertain estimate, the Ganges River Dolphin might still have a few thousand animals in its population, but the low end is 1,200 or so.

The Indus River dolphin, which is fairly similar to the Ganges, is in worse shape.

Pakistan's blind dolphins face hazardous existence

The maximum number is 1,200 or so. These are unique animals -- plus they're cute -- and we still have a chance to save them. (If the number is right, there's still more Indus River dolphins than whooping cranes, of which there are 400 or so, and black-footed ferrets, around 500 or so). So it's worth it to try and save them -- but given the political/social instability in Pakistan, it won't be easy.

Here's a map of where they are and a picture of the appealing Indus river dolphin.