There are numerous differences.
A platypus is a monotreme.
A male platypus could kill a cat. It would have enough venom in its spur to achieve this. A female platypus does not have a venomous spur.
The platypus's spur is sharp and attached to a venom gland in the platypus's thigh. The echidna's spur is blunt, and is not attached to a functional venom gland.
whiskers
the "m"
they both have mammary glands which they use to feed their young
A big cat can roar but a little cat can only purr
there isnt a difference moron
There is a 10 hour difference.
One is real, and one is not. There is no such thing as a spoon billed platypus.
They give birth to live babies, but the platypus lays eggs.
it is the organising of : types of cell, number of cells,