A photograph of an animal long-gone evokes a feeling of loss more than a painting ever can. Often tinted sepia or black-and-white, these images were mainly taken in zoos or wildlife parks, and in a handful of cases featured the last known individual of the species. There are some familiar examples, such as Martha, the last Passenger Pigeon, or the Ivory-billed Woodpecker, recently fledged and perching happily on the hat of one of the biologists that had just ringed it.