There are significant differences between Singapore Zoo and River Ecological Park in theme, animal species and ways of visiting.

1. Theme: The theme of Singapore Zoo is to show the tropical rain forest, while the theme of River Ecological Park is to show the river ecosystem and related animals.

2. Animal species: The Singapore Zoo displays more than 3 species of animals, including tropical rain forest animals, such as elephants, proboscis monkeys, Asian elephants and Bengal tigers. The river ecological park mainly displays animals related to the river ecosystem, such as giant pandas, finless porpoises, herons and egrets.

3. Mode of visit: Singapore Zoo adopts an open design, which allows visitors to get closer to animals and have the opportunity to experience the wonders of nature in depth. The river ecological park displays animals through the layout of river basins, and visitors can learn about the living environment and ecological habits of animals in different rivers during the visit.

Generally speaking, Singapore Zoo and River Ecological Park are different in theme, animal species and visiting methods, but they are both important wildlife reserves in Singapore, providing visitors with unique opportunities to observe and understand animals at close range.