Existing birds of the suborder Ornithischia can be grouped into three general orders, namely:

1. Platyhelminthes

2. Penguiniformes

3. Suddenly Thoraciciformes Suddenly Thoraciciformes can be subdivided as follows:

1.

6, Geese

7, Falcons

8, Chickadees

9, Cranes

10, Plovers

11, Pigeons

12, Parakeets

13, Cuckoos

14, Owls

15, Nighthawks

< p>16, Rainbirds

17, Mousebirds

18, Cuckoos

19, Buddhist monks

20, Flickers

21, Sparrows