For the First Time, Lego Has Given an Animal . . . an Anus
Yes, the tiger has a small, circular pink piece that fits underneath its tail. The specific part is also used for flowers, among other things.
Lego can afford to play it fast and loose with details due to their blockish nature. So, you wouldn't expect Lego ANIMALS to be "anatomically correct." But that's changing as their sets become increasingly intricate.
Check out the Reddit thread with ALLLLL OF THE DETIAL on this tiger below.