The platypus is not related to birds. They are monotremes. (mammals that lay eggs.)
No. Ducks are birds and the Platypus is a monotreme which is an egg-laying mammal.
It is Platypus.
For a map of where the platypus can be found, see the related link.
Platypus eggs are not hard-shelled, like birds' eggs. They are soft-shelled and leathery.
No. The platypus is not produced by crossing any animals. They were in Australia long before white man came and started degrading the environment and nature. Platypuses are monotremes - egg-laying mammals - and not at all related to rats (placental mammals) or ducks (birds).
Birds, most fish and insects, and the platypus and echidna.
Several diagrams of the platypus - both external and internal - can be found at the related link below.
They mate like mammals
A puffin is a unique species, not a hybrid. ~{Insomniac Platypus}~
insect orginisms that dwell in the mud or soil.
Birds are not mammals. They are in their own category, which is "Birds". The only two egg-laying mammals are the platypus and the echidna, which are classified as monotremes.
No other animal looks like a platypus. It is completely unique.