The lioness and the vixen
A lioness and a vixen（雌狐，泼妇） were talking together about their young, as mothers will, and saying how healthy and well-grown they were, and what beautiful coats they had, and how they were the image of their parents. "My litter of cubs is a joy to see," said the fox, and then she added, rather maliciously, "But I notice you never have more than one." "No," said the lioness grimly（可怕地）, "but that one's a lion."
Quality, not quantity.