SOUTH BEND, Ind. (AP) — Four young Amur tigers have joined the Potawatomi Zoo in South Bend, less than a year after the zoo had to euthanize its two aged tigers.

Potawatomi Zoo curator Josh Sisk says the four new tigers are sisters and were born two years ago in Columbus, Ohio. He tells the South Bend Tribune that the zoo didn’t know it would get so many or such young tigers.

Sisk says the new tigers named Morgana, Taj, Ursula and Glinda likely won’t stay together once they turn 4 years old, and would go to other zoos for breeding. He says the South Bend zoo might get a male tiger so it can have its own breeding program.

Amur tigers are considered endangered by the International Union for Conservation of Nature.