You should say:
what animal it was
what it looked like
where you saw it
and explain what people in your country feel about this animal.
雅思口语考试话题范文参考：
One never tires of watching lovely red-crowned cranes.
Red-crowned Crane is snow white with a black neck, black patches on its wings and red on top of its head. It stands almost five feet tall and has long legs. It has a long pointy beak for spearing its prey.
Cranes are regarded as a bird of good luck in China. In Chinese culture, cranes have existed for over 3,000 years. Then there have been a lot of legends and stories about cranes. Red-crowned Crane can live as long as 60 years. So it is the longest-living of all bird species. For centuries, cranes have been revered in China as symbols of longevity.
The image of the Red-crowned Crane can be seen in many places in China. People often draw red crowned crane and pine together. The lifespan of both pines and cranes are very long. So people use them to symbolize longevity. Red-crowned cranes dance the most beautiful dances in the world of birds. While dancing, they half-open their wings, and they jump around and sing for each other. That's why peopele consider crane as elegance.
Red-crowned cranes are one of the world's most endangered species. Despite protective laws, poaching continues to remain a problem.