As a member of this world, do you really understand the world? How much do you know about the world?

Cuckoo, a unique application of the concept, will help you open up a corner of your understanding of the world in a simple way. You can video chat with anyone you want!

Then follow Cuckoo into nature!

Here, you can learn about all kinds of birds in the world. Of course, you can also post information about birds you know about. It's very simple, you just upload pictures of the birds you know and a description of them and so on.

The world is a whole, join Cuckoo, let you better understand the diversity of this world.