Yes, the 10 cent coin is smaller. The Australian 10 cent coin is 23.60 mm in diameter. The Australian 20 cent coin is 28.52 mm in diameter.
on the Australian 20 cent coin it the platypus
The Australian 5 cent coin has an echidna on it?
Australian five-cent coin was created in 1966.
Australian twenty-cent coin was created in 1966.
There is no flower on the reverse of an Australian 50 cent coin.
Such a coin does not exist. The first Australian 10 cent coin was issued in 1966.
The Australian 20 cent coin features a platypus on the reverse.
Such a coin does not exist. The Australian 2 cent coin was first issued in February 1966.
The lyrebird is on an Australian ten cent coin.
The Australian 2 cent coin was introduced at the changeover to decimal currency in 1966. There were no Australian "cent" coins minted prior to 1966.
There is no silver in any circulating Australian decimal coin.