Send your sister a colourful surprise on her special day with this hummingbird-themed pop-up card – a thoughtful and unique way to say Happy Birthday! You Are Viewing: A Birthday Pop Up Card By Second Nature. Occasion: Perfect for a birthday celebration. Message: Blank. Details: This pop-up greeting card from Second Nature’s Clever Cubes range has been designed with hummingbirds and colourful wildflowers surrounding a tag that reads “happy birthday” for a special sister. The unwrapped card is sure to bring joy to its recipient. Good to know: This Pop Up Card is eco-friendly and comes with a pink envelope. It’s made from card, printed with vegetable soy inks and packaged in eco-card packaging. Size: 14cm x 24.5cm or 5.5″ x 9.6″ Postal Size: Large Letter