Wish your wonderful daughter and son-in-law a Happy Valentine's Day with a card featuring a cute red bird sharing a worm with her love, a blue bird on a leafy branch on a blue background with white text and a beautiful swirl. There are approximately 10,500 known species of birds in the world, according to the International Ornithologistsí Union. Design by Laurie Schneider, elements by Applehead Creationz, HP Projekt. Fun facts; The Valentine's Day chocolate boxes were introduced in 1868 by Richard Cadbury. The red rose was the favorite flower of Venus, the Roman goddess of love. The color red stands for strong romantic feelings making the red rose the flower of love.