The bullfinch is often used as a motif on Christmas cards and it is also common to decorate with figures that represent the bullfinch at Christmas
The bullfinch thrives in the woods, it eats a lot of seeds of low flowering plants in the forest floor, which becomes inaccessible when it’s snowy. Access to other seeds, such as from the ash tree, will be tougher during winter too.
The red-coloured chest and that the bullfinch appears on bird feeders in November / December when it’s getting harder to find seeds in the forest, has contributed to making it a symbol of Christmas.
Fun fact: The bullfinch is often drawn sitting in a Christmas sheave, but the bullfinch doesn’t eat grain