
In common Dutch, the guinea pig is named 'cavia'. Which is also part of the scientific name, Cavia porcellus.
A nowadays old-fashioned Dutch word for cavia is 'Guinees biggetje', which means 'Guinea piglet'. However, the animal is no family of pigs, nor origins from Guinea, but from the Andes mountains.
In English, the term 'guinea pig' is also used as a metaphor for a subject of scientific experiments. In contrary in Dutch, an other animal is the unlucky one in common language, namely the 'proefkonijn' ('experiment rabbit').
A large cousin of the cavia is the capibara, whose name also starts with the letter 'C'. In English it is spelled with a 'y', in Dutch we use an 'i' instead.
I would love to have a capybara stamp in hands, but alas I haven't. Fortunately I found on the internet several nice pictures, among them these two from lands they are living in, these largest rodents in the world:


Curious to know what other stamp lovers have in mind when thinking of the letter 'c'? Check the delightful Sunday stamps site and the links mentioned there!