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By Kevin Peachey
Cost of living correspondent
An entirely new set of UK coins will start to enter circulation at the end of the year to mark the new monarch and his love of the natural world.
The tails side of every coin from the 1p to the £2 will feature the country's flora and fauna, reflecting King Charles III's passion for conservation.
His now-familiar portrait will be on each coin - many for the first time.
Old coins will still be accepted in the shops, with the new set struck in response to demand.
Although cash use - and especially the popularity of coins - has been in decline in recent years, the Royal Mint says heritage and need mean this change is still required.
"We know a large proportion of the country are still heavily reliant on cash," said Rebecca Morgan, director at the Mint.
"It is also tradition to mark the moment of a monarch coming to the throne with a new set of coinage, so it is important that we carry on that tradition."
The BBC was given an advance viewing of the new coins, the size and shape of which remain unchanged.
Although there have been commemorative coins circulating featuring King Charles, these new designs - officially known as definitives - mark the final chapter of the King's transition onto coinage.
Definitive coins feature the standard designs seen on the majority of official currency. These designs stay the same for years or even decades.
The previous set featured a shield formation and was introduced under Queen Elizabeth II in 2008, and will still dominate the 29 billion coins in circulation in the UK for some time yet.
The reverse, or tails side, of the new coins will be the matter of most interest to collectors and for quizmasters. They are designed to show the importance, and precariousness, of the natural world:
- 1p: A hazel dormouse, which has seen its population halve since 2007
- 2p: A red squirrel, which is expected to blend into the colour of the copper coin
- 5p: An oak tree leaf, signifying its role as a rich habitat for biodiversity in woodland areas and an association with monarchy of the past
- 10p: The capercaillie - the world's largest grouse - found in a small part of Scotland and threatened with extinction
- 20p: A puffin
- 50p: The Atlantic salmon, which is at threat from river pollution and habitat loss
- £1: Bees
- £2: National flowers - a rose for England, a daffodil for Wales, a thistle for Scotland and a shamrock for Northern Ireland
Kevin Clancy, director of the Royal Mint Museum, said: "People who remember pre-decimal coins might recall the wren farthing, or the thrift design on the 12-sided thrupence, but it wasn't lots of natural world.
"What is different about these coins is that they are all about the natural world."
There are also links to history and the changing of the monarchy.
Three interlocking Cs feature on the coins, representing the third King Charles, and taking its inspiration from the cypher of Charles II.
The edge inscription of the new £2 coin was chosen by the new King Charles and reads: "In servitio omnium", which means: "In the service of all".
It was taken from his inaugural speech in September last year.
The coins follow centuries of tradition with the monarch now facing left - the opposite way to his predecessor. Profiles are alternated between left and right for successive monarchs. As with previous British kings, and unlike the Queen, he wears no crown.
New banknotes featuring the image of King Charles are being printed in their millions but will not enter circulation until the middle of next year - some months after the coins.
New notes will replace damaged or worn older ones, but their introduction is slow because machines such as self-service tills need to recognise the new image.