I had a little hen, the prettiest ever seen,
She washed me the dishes, and kept the house clean;
She went to the mill to fetch me some flour,
She brought it home in less than an hour;
She baked me my bread, she brewed me my ale,
She sat by the fire and told many a fine tale.

“Little Hen” is a term of endearment used in Scotland and therefore implies a rhyme with Scottish origins.
“Little Hen” would often be used when referring to the daughter of the house. The imagination of children, however, take the meaning of all words literally, thus any illustrations of this story always depict a little hen.
See also: “I Had A Little Wife, The Prettiest Ever Seen” …