A few nice extinct animals images I found:
Galapagos tortoises (Chelonoidis nigra sp.) on Floreana, Galapagos Islands
Image by Dallas Krentzel
The male in the back was previously mounting the female and was trying to re-obtain his position, it seemed. He was a little frustrated, to say the least. He was eventually successful, but the female seemed keen on getting away.
The tortoises of the island of Floreana went extinct after human invasion (Floreana is probably the most ecologically devastated of the islands in the archipelago, which was sad to see in a lot of ways), but recently a population of tortoises has been reintroduced from other islands (hence the species/subspecies status is uncertain in these photos, as with those I took on Isabela, also re-introduced individuals).
Banded Mongoose (Mungos mungo)
Image by cliff1066™
Known to many people from Rudyard Kipling's The Jungle Book, mongooses are small, catlike carnivores. There are more than 30 species of mongooses living in a variety of habitats in Asia, Africa, and southern Europe, as well as some Caribbean and Hawaiian islands, where they were introduced in the late 19th century to control rats and snakes and instead caused several bird species to go extinct.