A few nice extinct animals images I found:
Galapagos tortoises (Chelonoidis nigra sp.) on Isabela, Galapagos Islands
Image by Dallas Krentzel
This young (probably 10-15 yrs) tortoise was apart of a population of released tortoises here in the southern portion of Isabela Island. Reportedly, the tortoises in this area had become locally extinct, and so the only tortoises we saw in this region were apart of this reintroduced group, thus they were all small and young. It was pretty common to see them on the side of the road and find their poop along the trails. Their feces is composed of essentially just a skeleton of dry cactus fibers, once the moisture dries out, and seems to stick around for a while. We actually found some of their feces on a tall staircase that went up to a watch out point (each step was probably about 3-5 in tall, 2-3 ft wide, so it's not entirely unbelievable that they could climb up so far, but the question is "why?").
Image by Rennett Stowe
Markhors are highly endangered. It is likely that Pakistan's national animal will go extinct in the wild within the next fifty years.