Solution:
Psittacula belongs to class Aves. Ornithorhynchus and Macropus belongs to class Mammalia. In both Aves and Mammalia 4 chambered heart is present. Oviparity is present in Ornithorhynchus. Oviparity is absent in Macropus. Pneumatic bones are present in class Aves. Dry and cornified skin is present in class Reptilia.
