Some animals cannot be placed in the main part of the zoo, so they won't appear in your card bar. You might have noticed that with Amazonian animals and decorations, as well as decorations for special regions like the Serengeti. The Black-backed Jackal is an animal that can only be kept in the Serengeti region (or in the Zoo d'Amour in a Serengeti breeding enclosure).
You can still find them in your inventory though (the button with the box next to the card bar).
You can find out more about the Serengeti in our forums!