What is common among parrot, platypus and kangaroo?
Toothless jaws
Pre-anal tail
Oviparity
Homeothermy
Birds (e.g., parrot) and mammals (e.g., platypus and kangaroo) are homeotherms.
Teeth are present in kangaroo. Kangaroo is viviparous. All of these have a post-anal tail.