Of course, you can set off and search in the wild for bird nests. Then by carefully observing the birds, you will see which one belongs to which bird.

Any easier option might be to visit Kanyana Wildlife Rehabilitation Centre. They have a wonderful collection of real nests from local wild birds.You can see them, by visiting Kanyana on a Discover Tour.
Visit the website to book.

These are a few examples of real nests on display there.