What is the fine-grained topic of the following text: Since the Zoo opened in 1977, Cuddles the African Elephant has been a resident here the whole time and seen the Zoo change and evolve to what it is today.The Zoo has achieved great things over its 35 year history including releasing Przewalski’s Horse back into the wild in Mongolia, achieving the world first Black Rhino embryo via IVF, breeding the first Galapagos Tortoise hatchling in Australasia as well as many important breeding successes for critically endangered animals. Only return the topic.
Achievements and history of the Zoo