They're probably the best known celebration cakes around and retailers have been giving their caterpillars a spooky makeover for Halloween.
While M&S has turned its original Colin the Caterpillar into a 'Double Choc Yummy Mummy', Morrisons' has become Patch The Pumpkin.
As with the corgi cakes that both launched to celebrate the Queen's Platinum Jubilee, they're once again in high demand with shoppers eager to get their hands on one.
