The study and collecting of postcards is termed "deltiology".

It is possible to form a large collection of postcards around the theme of parrots and parakeets which were very popular subjects, especially on the early comic or saucy postcards. At the peak of their popularity, in the 1930s, sales of saucy postcards alone reached a massive 16 million a year.

It would appear that there were at least three sets of postcards published around 1910 by Capern's to promote their packets of parrot food.

These cards can often be found for sale on eBay in varying condition. Some have plain backs and some are printed with a divided postcard back.

Can anyone remember Capern's food?